diff --git a/mindspore/ccsrc/backend/session/ascend_session.cc b/mindspore/ccsrc/backend/session/ascend_session.cc
index 3f31f7f324e..266a9050ea8 100644
--- a/mindspore/ccsrc/backend/session/ascend_session.cc
+++ b/mindspore/ccsrc/backend/session/ascend_session.cc
@@ -64,6 +64,7 @@
 #include "toolchain/adx_datadump_server.h"
 #ifdef ENABLE_DUMP_IR
 #include "debug/rdr/running_data_recorder.h"
+#include "runtime/device/ascend/ascend_bucket.h"
 #endif
 #if ENABLE_CPU && ENABLE_D
 #include "ps/util.h"
@@ -258,6 +259,7 @@ GraphId AscendSession::CompileGraphImpl(const AnfNodePtrList &lst, const AnfNode
   // construct graph, if successfully, graph_sum_ + 1
   auto graph = ConstructKernelGraph(lst, outputs);
   auto graph_id = graph->graph_id();
+  InitAllBucket(graph);
   MS_LOG(INFO) << "Compile graph " << graph_id << " success";
   return graph_id;
 }
@@ -632,6 +634,13 @@ void AscendSession::RunOpImpl(const GraphInfo &graph_info, OpRunInfo *op_run_inf
   MS_EXCEPTION_IF_NULL(op_run_info);
   BuildOpImpl(*op_run_info, graph_info, *input_tensors, tensors_mask);
   EraseValueNodeTensor(tensors_mask, input_tensors);
+
+  // wait for allreduce
+  for (auto &tensor : *input_tensors) {
+    if (tensor->NeedWaitDevice()) {
+      tensor->WaitDevice();
+    }
+  }
   // Run op
   auto graph = run_op_graphs_[graph_info];
   MS_EXCEPTION_IF_NULL(graph);
@@ -1510,5 +1519,9 @@ void AscendSession::SyncStream() {
     MS_LOG(EXCEPTION) << "Sync stream error!";
   }
 }
+
+std::shared_ptr<device::Bucket> AscendSession::CreateBucket(uint32_t bucket_id, uint32_t bucket_size) {
+  return std::make_shared<device::ascend::AscendBucket>(bucket_id, bucket_size);
+}
 }  // namespace session
 }  // namespace mindspore
diff --git a/mindspore/ccsrc/backend/session/ascend_session.h b/mindspore/ccsrc/backend/session/ascend_session.h
index 8a36cd43bba..b160395a035 100644
--- a/mindspore/ccsrc/backend/session/ascend_session.h
+++ b/mindspore/ccsrc/backend/session/ascend_session.h
@@ -61,6 +61,7 @@ class AscendSession : public SessionBasic {
   void BuildOpsInGraph(const GraphId &graph_id, const std::map<AnfNodePtr, size_t> &parameter_index,
                        const std::vector<tensor::TensorPtr> &graph_inputs,
                        const std::map<KernelWithIndex, size_t> &cnode_refcount) override;
+  std::string GetCommWorldGroup() override { return kHcclWorldGroup; }
 
  private:
   // compile child graph when session have multiple child graphs
@@ -123,6 +124,7 @@ class AscendSession : public SessionBasic {
                              const std::vector<tensor::TensorPtr> &graph_inputs,
                              const std::map<KernelWithIndex, OutputTensorInfo> &node_output_info,
                              InputTensorInfo *input_tensor_info);
+  std::shared_ptr<device::Bucket> CreateBucket(uint32_t bucket_id, uint32_t bucket_size) override;
   // key is final_graph_id,value is child graph execute order of final graph
   std::unordered_map<GraphId, std::vector<GraphId>> graph_execute_orders_;
   // key is final_graph_id,value is the graph types of child graphs
diff --git a/mindspore/ccsrc/backend/session/gpu_session.cc b/mindspore/ccsrc/backend/session/gpu_session.cc
index 6235e86e614..104306f9f1f 100644
--- a/mindspore/ccsrc/backend/session/gpu_session.cc
+++ b/mindspore/ccsrc/backend/session/gpu_session.cc
@@ -16,6 +16,7 @@
 #include "backend/session/gpu_session.h"
 
 #include <string>
+#include <utility>
 #include "backend/optimizer/common/helper.h"
 #include "backend/optimizer/common/optimizer.h"
 #include "backend/optimizer/common/pass_manager.h"
@@ -63,6 +64,7 @@
 #include "runtime/device/kernel_runtime_manager.h"
 #include "runtime/device/gpu/cuda_driver.h"
 #include "runtime/device/gpu/distribution/collective_init.h"
+#include "runtime/device/gpu/gpu_bucket.h"
 #include "utils/ms_utils.h"
 #include "utils/config_manager.h"
 #include "utils/ms_context.h"
@@ -394,6 +396,8 @@ GraphId GPUSession::CompileGraphImpl(KernelGraphPtr graph) {
     manager->AddFuncGraph(graph);
     graph->set_manager(manager);
   }
+
+  InitAllBucket(graph);
   // Alloc memory in graph mode, including static memory and dynamic memory
   if (!pynative_mode) {
     AllocateMemory(graph.get());
@@ -473,6 +477,12 @@ void GPUSession::RunOpImpl(const GraphInfo &graph_info, OpRunInfo *op_run_info,
   MS_EXCEPTION_IF_NULL(op_run_info);
   BuildOpImpl(*op_run_info, graph_info, *input_tensors, tensors_mask);
   EraseValueNodeTensor(tensors_mask, input_tensors);
+  // wait for allreduce
+  for (auto &tensor : *input_tensors) {
+    if (tensor->NeedWaitDevice()) {
+      tensor->WaitDevice();
+    }
+  }
   // run op
   auto kernel_graph = run_op_graphs_[graph_info];
   MS_EXCEPTION_IF_NULL(kernel_graph);
@@ -548,6 +558,10 @@ void GPUSession::SyncStream() {
     MS_LOG(EXCEPTION) << "Sync stream error!";
   }
 }
+
+std::shared_ptr<device::Bucket> GPUSession::CreateBucket(uint32_t bucket_id, uint32_t bucket_size) {
+  return std::make_shared<device::gpu::GPUBucket>(bucket_id, bucket_size);
+}
 }  // namespace gpu
 }  // namespace session
 }  // namespace mindspore
diff --git a/mindspore/ccsrc/backend/session/gpu_session.h b/mindspore/ccsrc/backend/session/gpu_session.h
index 2a9e23f933b..93cadc5cd86 100644
--- a/mindspore/ccsrc/backend/session/gpu_session.h
+++ b/mindspore/ccsrc/backend/session/gpu_session.h
@@ -19,6 +19,7 @@
 #include <vector>
 #include <memory>
 #include <algorithm>
+#include <string>
 #include "backend/session/session_basic.h"
 #include "backend/session/kernel_graph.h"
 #include "backend/session/session_factory.h"
@@ -44,6 +45,8 @@ class GPUSession : public SessionBasic {
                    const std::vector<int64_t> &tensors_mask) override;
   void RunOpImpl(const GraphInfo &graph_info, OpRunInfo *op_run_info, std::vector<tensor::TensorPtr> *input_tensors,
                  VectorRef *outputs, const std::vector<int64_t> &tensors_mask) override;
+  std::shared_ptr<device::Bucket> CreateBucket(uint32_t bucket_id, uint32_t bucket_size) override;
+  std::string GetCommWorldGroup() override { return kNcclWorldGroup; }
 
  private:
   void SelectKernel(const std::shared_ptr<KernelGraph> &kernel_graph) const;
diff --git a/mindspore/ccsrc/backend/session/session_basic.cc b/mindspore/ccsrc/backend/session/session_basic.cc
index 6ccb8277cde..6d0a10981b1 100644
--- a/mindspore/ccsrc/backend/session/session_basic.cc
+++ b/mindspore/ccsrc/backend/session/session_basic.cc
@@ -40,6 +40,7 @@
 #include "debug/anf_ir_dump.h"
 #include "debug/common.h"
 #include "utils/trace_base.h"
+#include "frontend/parallel/context.h"
 #if (ENABLE_CPU && (ENABLE_D || ENABLE_GPU))
 #include "ps/ps_cache/ps_cache_manager.h"
 #include "ps/constants.h"
@@ -556,10 +557,12 @@ void HandleOpInputs(const std::set<KernelWithIndex> &input_kernel, std::map<Kern
 void HandleOpOutputs(const AnfNodePtr &kernel, const VectorRef &op_outputs,
                      const std::map<KernelWithIndex, std::vector<std::vector<size_t>>> &output_indexes,
                      const std::map<KernelWithIndex, size_t> &ref_count,
-                     std::map<KernelWithIndex, tensor::TensorPtr> *op_output_map, VectorRef *outputs) {
+                     std::map<KernelWithIndex, tensor::TensorPtr> *op_output_map, VectorRef *outputs,
+                     std::vector<TensorPtr> *runop_output_tensors) {
   MS_EXCEPTION_IF_NULL(kernel);
   MS_EXCEPTION_IF_NULL(op_output_map);
   MS_EXCEPTION_IF_NULL(outputs);
+  MS_EXCEPTION_IF_NULL(runop_output_tensors);
   auto output_tensors = TransformVectorRefToMultiTensor(op_outputs);
   if (output_tensors.size() > op_outputs.size()) {
     MS_LOG(EXCEPTION) << "Op output contains tuple, node = " << kernel->DebugString();
@@ -592,6 +595,7 @@ void HandleOpOutputs(const AnfNodePtr &kernel, const VectorRef &op_outputs,
       }
       BaseRef &tensor_ref = (*const_cast<VectorRef *>(cur_vector_ref))[ref_indexes.at(n)];
       tensor_ref = output_tensor;
+      runop_output_tensors->emplace_back(output_tensor);
     }
   }
 }
@@ -2196,6 +2200,11 @@ void SessionBasic::RunOpsInGraphImpl(const GraphId &graph_id, const std::vector<
   GetRefCount(kernel_graph.get(), &cnode_refcount);
   BuildOpsInGraph(graph_id, parameter_index, inputs, cnode_refcount);
 
+  // Clear bucket resources every step
+  if (kernel_graph->is_bprop()) {
+    ClearAllBucket(graph_id);
+  }
+
   std::map<KernelWithIndex, tensor::TensorPtr> op_output_map;
   for (const auto &kernel : kernel_graph->execution_order()) {
     // Generate input tensors, tensor masks and input kernel with index
@@ -2212,9 +2221,15 @@ void SessionBasic::RunOpsInGraphImpl(const GraphId &graph_id, const std::vector<
     RunOpImpl(graph_info, &run_info, &input_tensor_info.input_tensors, &op_outputs,
               input_tensor_info.input_tensors_mask);
 
+    std::vector<tensor::TensorPtr> new_output_tensors;
+
     // Handle inputs and outputs of current op
     HandleOpInputs(input_tensor_info.input_kernel, &cnode_refcount, &op_output_map);
-    HandleOpOutputs(kernel, op_outputs, output_indexes, cnode_refcount, &op_output_map, outputs);
+    HandleOpOutputs(kernel, op_outputs, output_indexes, cnode_refcount, &op_output_map, outputs, &new_output_tensors);
+    // Save grad node to Bucket
+    if (kernel_graph->is_bprop()) {
+      AddGradAddrToBucket(graph_id, new_output_tensors);
+    }
   }
   MS_LOG(INFO) << "Finish!";
 }
@@ -2287,6 +2302,137 @@ void SessionBasic::RunOpHideNopNode(const KernelGraphPtr &kernel_graph) const {
   }
 }
 
+std::vector<uint32_t> SessionBasic::GetAllReduceSplitIndex() {
+  auto ms_context = MsContext::GetInstance();
+  MS_EXCEPTION_IF_NULL(ms_context);
+  std::string group = GetCommWorldGroup();
+  auto parallel_context = parallel::ParallelContext::GetInstance();
+  MS_EXCEPTION_IF_NULL(parallel_context);
+  // PyNative not support multi group allreduce
+  group += "sum1";
+  return parallel_context->GetAllReduceFusionSplitIndices(group);
+}
+
+uint32_t GetBpropGraphGradsCount(const KernelGraphPtr &graph) {
+  return AnfAlgo::GetAllOutput(graph->output(), {prim::kPrimTupleGetItem}).size();
+}
+
+void SetGraphBpropAttr(const KernelGraphPtr &graph) {
+  auto &execution_orders = graph->execution_order();
+  if (std::any_of(execution_orders.begin(), execution_orders.end(),
+                  [](const AnfNodePtr &node) { return node->scope()->name().rfind("Gradient", 0) == 0; })) {
+    graph->set_is_bprop(true);
+    MS_LOG(INFO) << "Match bprop graph";
+  } else {
+    graph->set_is_bprop(false);
+  }
+}
+
+std::vector<uint32_t> GenerateBucketSizeList(const KernelGraphPtr &graph, const std::vector<uint32_t> &split_index) {
+  if (split_index.empty()) {
+    auto grads_count = GetBpropGraphGradsCount(graph);
+    if (grads_count == 0) {
+      MS_LOG(EXCEPTION) << "Bprop graph has no grad";
+    }
+    return {grads_count};
+  }
+
+  std::vector<uint32_t> bucket_size_list;
+  uint32_t old_index = 0;
+  for (auto &index : split_index) {
+    if (old_index == 0) {
+      bucket_size_list.emplace_back(index - old_index + 1);
+    } else {
+      bucket_size_list.emplace_back(index - old_index);
+    }
+    old_index = index;
+  }
+  return bucket_size_list;
+}
+
+void SessionBasic::InitAllBucket(const KernelGraphPtr &graph) {
+  MS_EXCEPTION_IF_NULL(graph);
+  MS_LOG(INFO) << "Init Bucket start, graph_id:" << graph->graph_id();
+  SetGraphBpropAttr(graph);
+
+  if (!graph->is_bprop()) {
+    return;
+  }
+
+  std::vector<std::shared_ptr<device::Bucket>> bucket_list;
+  // Create bucket for every split allreduce ops
+  auto split_index = GetAllReduceSplitIndex();
+  auto bucket_size_list = GenerateBucketSizeList(graph, split_index);
+  uint32_t bucket_id = 0;
+  for (auto bucket_size : bucket_size_list) {
+    MS_LOG(INFO) << "Create new bucket:" << bucket_id;
+    auto bucket = CreateBucket(bucket_id++, bucket_size);
+    bucket->Init();
+    bucket_list.emplace_back(bucket);
+  }
+
+  auto bucket_ret = bucket_map_.try_emplace(graph->graph_id(), bucket_list);
+  if (!bucket_ret.second) {
+    MS_LOG(EXCEPTION) << "Duplicate bucket_map_ graph key:" << graph->graph_id();
+  }
+  // set all free bucket index to 0
+  auto free_bucket_ret = free_bucket_id_map_.try_emplace(graph->graph_id(), 0);
+  if (!free_bucket_ret.second) {
+    MS_LOG(EXCEPTION) << "Duplicate free_bucket_id_map_ graph key:" << graph->graph_id();
+  }
+  MS_LOG(INFO) << "Init Bucket finish";
+}
+
+void SessionBasic::AddGradAddrToBucket(const GraphId &graph_id, const std::vector<tensor::TensorPtr> &grad_tensor) {
+  auto parallel_context = parallel::ParallelContext::GetInstance();
+  MS_EXCEPTION_IF_NULL(parallel_context);
+  auto parallel_mode = parallel_context->parallel_mode();
+  if (parallel_mode != parallel::DATA_PARALLEL) {
+    return;
+  }
+
+  auto iter = bucket_map_.find(graph_id);
+  if (iter == bucket_map_.end()) {
+    MS_LOG(EXCEPTION) << "unknown graph id:" << graph_id;
+  }
+  auto &bucket_list = iter->second;
+  auto free_bucket_iter = free_bucket_id_map_.find(graph_id);
+  if (free_bucket_iter == free_bucket_id_map_.end()) {
+    MS_LOG(EXCEPTION) << "unknown free graph id:" << graph_id;
+  }
+
+  auto free_bucket_index = free_bucket_iter->second;
+  for (auto &tensor : grad_tensor) {
+    if (free_bucket_index >= bucket_list.size()) {
+      MS_LOG(EXCEPTION) << "Invalid free bucket id:" << free_bucket_iter->second
+                        << " total bucket num:" << bucket_list.size();
+    }
+    auto &free_bucket = bucket_list[free_bucket_index];
+    free_bucket->AddGradTensor(tensor);
+    if (free_bucket->full()) {
+      MS_LOG(INFO) << "bucket is full";
+      free_bucket->Launch();
+      free_bucket_index = ++free_bucket_iter->second;
+      MS_LOG(INFO) << "new free bucket:" << free_bucket_index;
+    }
+  }
+}
+
+void SessionBasic::ClearAllBucket(const GraphId &graph_id) {
+  auto iter = bucket_map_.find(graph_id);
+  if (iter != bucket_map_.end()) {
+    auto bucket_list = iter->second;
+    for (auto &bucket : bucket_list) {
+      MS_LOG(INFO) << "Clear bucket:" << bucket->id();
+      bucket->Release();
+    }
+  }
+  auto free_iter = free_bucket_id_map_.find(graph_id);
+  if (free_iter != free_bucket_id_map_.end()) {
+    free_iter->second = 0;
+  }
+}
+
 #if (ENABLE_CPU && (ENABLE_D || ENABLE_GPU))
 void SessionBasic::InitPsWorker(const KernelGraphPtr &kernel_graph) {
   if (!ps::PSContext::instance()->is_worker()) {
diff --git a/mindspore/ccsrc/backend/session/session_basic.h b/mindspore/ccsrc/backend/session/session_basic.h
index d5ba15c8e92..f446b67bf3d 100644
--- a/mindspore/ccsrc/backend/session/session_basic.h
+++ b/mindspore/ccsrc/backend/session/session_basic.h
@@ -32,6 +32,7 @@
 #include "utils/contract.h"
 #include "runtime/device/kernel_info.h"
 #include "utils/ms_context.h"
+#include "runtime/device/bucket.h"
 #if !defined(_WIN32) && !defined(_WIN64)
 #include "debug/debugger/debugger.h"
 #endif
@@ -224,12 +225,20 @@ class SessionBasic : public std::enable_shared_from_this<SessionBasic> {
   void UpdateAllGraphDynamicShapeAttr(const std::vector<KernelGraphPtr> &all_graphs);
   void RunOpRemoveNopNode(const KernelGraphPtr &kernel_graph) const;
   void RunOpHideNopNode(const KernelGraphPtr &kernel_graph) const;
+  virtual std::shared_ptr<device::Bucket> CreateBucket(uint32_t bucket_id, uint32_t bucket_size) { return nullptr; }
+  void InitAllBucket(const KernelGraphPtr &graph);
+  void AddGradAddrToBucket(const GraphId &graph_id, const std::vector<tensor::TensorPtr> &grad_tensor);
+  void ClearAllBucket(const GraphId &graph_id);
+  std::vector<uint32_t> GetAllReduceSplitIndex();
+  virtual std::string GetCommWorldGroup() { return std::string(); }
 #if (ENABLE_CPU && (ENABLE_D || ENABLE_GPU))
   void CheckPSModeConsistence(const KernelGraphPtr &kernel_graph) const;
   void GetBatchElements(const AnfNodePtr &kernel_node) const;
   void InitPsWorker(const KernelGraphPtr &kernel_graph);
 #endif
 
+  std::map<uint32_t, std::vector<std::shared_ptr<device::Bucket>>> bucket_map_;
+  std::map<uint32_t, uint32_t> free_bucket_id_map_;
   std::unordered_map<GraphId, std::shared_ptr<KernelGraph>> graphs_;
   std::unordered_map<GraphInfo, std::shared_ptr<KernelGraph>> run_op_graphs_;
   std::unordered_map<FuncGraphPtr, KernelGraphPtr> front_backend_graph_map_;
diff --git a/mindspore/ccsrc/pipeline/pynative/pynative_execute.cc b/mindspore/ccsrc/pipeline/pynative/pynative_execute.cc
index a4cf0974985..07537067fdb 100644
--- a/mindspore/ccsrc/pipeline/pynative/pynative_execute.cc
+++ b/mindspore/ccsrc/pipeline/pynative/pynative_execute.cc
@@ -677,34 +677,9 @@ OpExecInfoPtr PynativeExecutor::GenerateOpExecInfo(const py::args &args) {
   return op_exec_info;
 }
 
-AnfNodePtr PynativeExecutor::MakeCNode(const OpExecInfoPtr &op_exec_info, std::vector<bool> *op_masks,
-                                       abstract::AbstractBasePtrList *args_spec_list) {
-  MS_EXCEPTION_IF_NULL(op_masks);
-  MS_EXCEPTION_IF_NULL(args_spec_list);
-  MS_EXCEPTION_IF_NULL(op_exec_info);
-
+void PynativeExecutor::GetArgsSpec(const OpExecInfoPtr &op_exec_info, std::vector<bool> *op_masks,
+                                   std::vector<AnfNodePtr> *inputs, abstract::AbstractBasePtrList *args_spec_list) {
   auto prim = op_exec_info->py_primitive;
-  std::vector<AnfNodePtr> inputs;
-  inputs.emplace_back(NewValueNode(prim));
-
-  const auto &signature = prim->signatures();
-  auto sig_size = signature.size();
-  auto size = op_exec_info->op_inputs.size();
-
-  // ignore monad signature
-  for (auto sig : signature) {
-    if (sig.default_value != nullptr && sig.default_value->isa<Monad>()) {
-      --sig_size;
-    }
-  }
-  if (sig_size > 0 && sig_size != size) {
-    MS_EXCEPTION(ValueError) << op_exec_info->op_name << " inputs size " << size << " does not match the requires "
-                             << "inputs size " << sig_size;
-  }
-  if (op_exec_info->op_name != prim::kPrimCast->name()) {
-    RunParameterAutoMixPrecisionCast(op_exec_info);
-  }
-  MS_LOG(DEBUG) << "Get op " << op_exec_info->op_name << " grad_flag_ " << grad_flag();
   for (size_t i = 0; i < op_exec_info->op_inputs.size(); i++) {
     abstract::AbstractBasePtr abs = nullptr;
     const auto &obj = op_exec_info->op_inputs[i];
@@ -733,11 +708,42 @@ AnfNodePtr PynativeExecutor::MakeCNode(const OpExecInfoPtr &op_exec_info, std::v
         if (input_node->abstract() != nullptr) {
           abs = input_node->abstract();
         }
-        inputs.emplace_back(input_node);
+        inputs->emplace_back(input_node);
       }
     }
     (*args_spec_list).emplace_back(CheckConstValue(prim, obj, abs, id, i));
   }
+}
+
+AnfNodePtr PynativeExecutor::MakeCNode(const OpExecInfoPtr &op_exec_info, std::vector<bool> *op_masks,
+                                       abstract::AbstractBasePtrList *args_spec_list) {
+  MS_EXCEPTION_IF_NULL(op_masks);
+  MS_EXCEPTION_IF_NULL(args_spec_list);
+  MS_EXCEPTION_IF_NULL(op_exec_info);
+
+  auto prim = op_exec_info->py_primitive;
+  std::vector<AnfNodePtr> inputs;
+  inputs.emplace_back(NewValueNode(prim));
+
+  const auto &signature = prim->signatures();
+  auto sig_size = signature.size();
+  auto size = op_exec_info->op_inputs.size();
+
+  // ignore monad signature
+  for (auto sig : signature) {
+    if (sig.default_value != nullptr && sig.default_value->isa<Monad>()) {
+      --sig_size;
+    }
+  }
+  if (sig_size > 0 && sig_size != size) {
+    MS_EXCEPTION(ValueError) << op_exec_info->op_name << " inputs size " << size << " does not match the requires "
+                             << "inputs size " << sig_size;
+  }
+  if (op_exec_info->op_name != prim::kPrimCast->name()) {
+    RunParameterAutoMixPrecisionCast(op_exec_info);
+  }
+  MS_LOG(DEBUG) << "Get op " << op_exec_info->op_name << " grad_flag_ " << grad_flag();
+  GetArgsSpec(op_exec_info, op_masks, &inputs, args_spec_list);
 
   CNodePtr cnode = nullptr;
   if (need_construct_graph()) {
diff --git a/mindspore/ccsrc/pipeline/pynative/pynative_execute.h b/mindspore/ccsrc/pipeline/pynative/pynative_execute.h
index e80cfdde154..cdab0426137 100644
--- a/mindspore/ccsrc/pipeline/pynative/pynative_execute.h
+++ b/mindspore/ccsrc/pipeline/pynative/pynative_execute.h
@@ -208,6 +208,8 @@ class PynativeExecutor : public std::enable_shared_from_this<PynativeExecutor> {
                                     PynativeStatusCode *const status);
   AnfNodePtr GetObjNode(const py::object &obj, const std::string &obj_id);
   AnfNodePtr MakeValueNode(const py::object &obj, const std::string &obj_id);
+  void GetArgsSpec(const OpExecInfoPtr &op_exec_info, std::vector<bool> *op_masks, std::vector<AnfNodePtr> *inputs,
+                   abstract::AbstractBasePtrList *args_spec_list);
   AnfNodePtr MakeCNode(const OpExecInfoPtr &op_exec_info, std::vector<bool> *op_masks,
                        abstract::AbstractBasePtrList *args_spec_list);
   abstract::AbstractBasePtr CheckConstValue(const PrimitivePyPtr &prim, const py::object &obj,
diff --git a/mindspore/ccsrc/runtime/device/CMakeLists.txt b/mindspore/ccsrc/runtime/device/CMakeLists.txt
index a2466381768..b5e644420af 100644
--- a/mindspore/ccsrc/runtime/device/CMakeLists.txt
+++ b/mindspore/ccsrc/runtime/device/CMakeLists.txt
@@ -1,5 +1,7 @@
 file(GLOB_RECURSE DEVICE_SRC_LIST RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} "common/*.cc"
-    "kernel_info.cc" "executor/dynamic_kernel.cc" "executor/executor_callback.cc" "kernel_runtime.cc" "memory_manager.cc" "kernel_runtime_manager.cc" "convert_tensor_utils.cc"
+    "kernel_info.cc" "executor/dynamic_kernel.cc" "executor/executor_callback.cc" "kernel_runtime.cc"
+    "memory_manager.cc" "kernel_runtime_manager.cc" "convert_tensor_utils.cc"
+    "bucket.cc"
 )
 
 if(ENABLE_GPU)
diff --git a/mindspore/ccsrc/runtime/device/ascend/ascend_bucket.cc b/mindspore/ccsrc/runtime/device/ascend/ascend_bucket.cc
new file mode 100644
index 00000000000..2da39ef7268
--- /dev/null
+++ b/mindspore/ccsrc/runtime/device/ascend/ascend_bucket.cc
@@ -0,0 +1,173 @@
+/**
+ * Copyright 2020 Huawei Technologies Co., Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "runtime/device/ascend/ascend_bucket.h"
+
+#include <vector>
+#include <memory>
+#include "runtime/mem.h"
+#include "external/hccl/hccl.h"
+#include "runtime/device/ascend/ascend_memory_pool.h"
+#include "backend/kernel_compiler/hccl/hcom_util.h"
+#include "backend/kernel_compiler/hccl/hccl_context.h"
+#include "runtime/device/memory_manager.h"
+#include "runtime/device/kernel_runtime_manager.h"
+#include "runtime/device/ascend/ascend_event.h"
+#include "utils/profile.h"
+
+#define CHECK_ASCEND_RT_WITH_EXCEPTION(expression, message)    \
+  {                                                            \
+    rtError_t ret = (expression);                              \
+    if (ret != RT_ERROR_NONE) {                                \
+      MS_LOG(EXCEPTION) << message << ", error code: " << ret; \
+    }                                                          \
+  }
+
+namespace mindspore::device::ascend {
+void AscendBucket::AllocateAllReduceAddr() {
+  // Check bucket is full
+  if (grad_tensor_list_.size() != bucket_size_) {
+    MS_LOG(EXCEPTION) << "grad tensor list size:" << grad_tensor_list_.size()
+                      << " is not equal to bucket size:" << bucket_size_;
+  }
+
+  auto total_size = 0;
+  std::vector<size_t> align_size_list;
+  std::vector<size_t> origin_size_list;
+  for (auto &tensor : grad_tensor_list_) {
+    MS_EXCEPTION_IF_NULL(tensor);
+    tensor_type_list_.emplace_back(tensor->data_type());
+    DeviceAddressPtr device_address = std::dynamic_pointer_cast<DeviceAddress>(tensor->device_address());
+    auto origin_size = device_address->GetSize();
+    auto align_size = MemoryManager::GetCommonAlignSize(origin_size);
+    origin_size_list.emplace_back(origin_size);
+    align_size_list.emplace_back(align_size);
+    total_size += align_size;
+    memcpy_input_addrs_.emplace_back(std::make_shared<kernel::Address>(
+      static_cast<uint8_t *>(device_address->GetMutablePtr()), device_address->GetSize()));
+  }
+
+  total_size_ = total_size;
+
+  auto runtime_instance = device::KernelRuntimeManager::Instance().GetCurrentKernelRuntime();
+  MS_EXCEPTION_IF_NULL(runtime_instance);
+  // AllReduce input output addr need to clear zero
+  ar_input_addr_ = runtime_instance->MallocCommunicationMemFromMemPool(total_size);
+  ar_output_addr_ = runtime_instance->MallocCommunicationMemFromMemPool(total_size);
+
+  // generate memecpy output addr
+  uint8_t *memcpy_output = ar_input_addr_;
+  for (size_t i = 0; i < bucket_size_; ++i) {
+    memcpy_output_addrs_.emplace_back(std::make_shared<kernel::Address>(memcpy_output, origin_size_list[i]));
+    memcpy_output += align_size_list[i];
+  }
+
+  // store output tensor addr
+  uint8_t *tensor_output = ar_output_addr_;
+  for (size_t i = 0; i < bucket_size_; ++i) {
+    new_tensor_output_addrs_.emplace_back(tensor_output);
+    tensor_output += align_size_list[i];
+  }
+}
+
+void AscendBucket::FreeDeviceMem(void *dev_ptr) { AscendMemoryPool::GetInstance().FreeTensorMem(dev_ptr); }
+
+void AscendBucket::FreeAllDeviceMem() {
+  if (ar_input_addr_ != nullptr) {
+    uint8_t *origin_dev_addr = ar_input_addr_ - kMemAlignSize;
+    FreeDeviceMem(origin_dev_addr);
+    ar_input_addr_ = nullptr;
+  }
+  if (ar_output_addr_ != nullptr) {
+    uint8_t *origin_dev_addr = ar_output_addr_ - kMemAlignSize;
+    FreeDeviceMem(origin_dev_addr);
+    ar_output_addr_ = nullptr;
+  }
+}
+
+void AscendBucket::CopyTensorToContiguousMemory() {
+  // Clean input addr
+  CHECK_ASCEND_RT_WITH_EXCEPTION(rtMemsetAsync(ar_input_addr_, total_size_, 0, total_size_, compute_stream_),
+                                 "Call rtMemsetAsync failed");
+
+  for (size_t i = 0; i < bucket_size_; ++i) {
+    MS_EXCEPTION_IF_NULL(memcpy_input_addrs_[i]);
+    MS_EXCEPTION_IF_NULL(memcpy_output_addrs_[i]);
+    MS_LOG(DEBUG) << "MemcpyAsync dst size:" << memcpy_output_addrs_[i]->size
+                  << " src size:" << memcpy_input_addrs_[i]->size;
+    if (memcpy_output_addrs_[i]->size < memcpy_input_addrs_[i]->size) {
+      MS_LOG(EXCEPTION) << "rtMemcpyAsync dst size < src size";
+    }
+
+    CHECK_ASCEND_RT_WITH_EXCEPTION(
+      rtMemcpyAsync(memcpy_output_addrs_[i]->addr, memcpy_output_addrs_[i]->size, memcpy_input_addrs_[i]->addr,
+                    memcpy_input_addrs_[i]->size, RT_MEMCPY_DEVICE_TO_DEVICE, compute_stream_),
+      "Call rtMemcpyAsync failed");
+  }
+}
+
+void AscendBucket::LaunchAllReduce() {
+  if (tensor_type_list_.empty()) {
+    MS_LOG(EXCEPTION) << "No tesnor type found";
+  }
+
+  // AllReduce inputs data type should be same
+  auto type = tensor_type_list_[0];
+  if (std::any_of(tensor_type_list_.begin(), tensor_type_list_.end(),
+                  [&type](TypeId tensor_type) { return type != tensor_type; })) {
+    MS_LOG(EXCEPTION) << "allreduce input have different dtype";
+  }
+
+  auto iter = CONST_OP_HCOM_DATA_TYPE_MAP.find(type);
+  if (iter == CONST_OP_HCOM_DATA_TYPE_MAP.end()) {
+    MS_LOG(EXCEPTION) << "unknown data type:" << type;
+  }
+
+  uint32_t type_size;
+  if (!HcomUtil::GetHcomTypeSize(iter->second, &type_size)) {
+    MS_LOG(EXCEPTION) << "get hcom type size fialed";
+  }
+
+  if (type_size == 0 || total_size_ % type_size != 0) {
+    MS_LOG(EXCEPTION) << "Total_size[" << total_size_ << "],Type_size[" << type_size << "] != 0, fail!";
+  }
+  auto hccl_count = total_size_ / type_size;
+
+  HcclReduceOp op_type = HcclReduceOp::HCCL_REDUCE_SUM;
+  auto hccl_result = HcclAllReduce(ar_input_addr_, ar_output_addr_, hccl_count, iter->second, op_type,
+                                   kernel::HcclContext::GetInstance().hccl_comm(), stream_);
+  if (hccl_result != HCCL_SUCCESS) {
+    MS_LOG(EXCEPTION) << "HcclAllReduce faled, ret:" << hccl_result;
+  }
+}
+
+void AscendBucket::Init() {
+  pre_event_ = std::make_shared<AscendEvent>();
+  post_event_ = std::make_shared<AscendEvent>();
+
+  auto kernel_runtime = KernelRuntimeManager::Instance().GetCurrentKernelRuntime();
+  MS_EXCEPTION_IF_NULL(kernel_runtime);
+  compute_stream_ = kernel_runtime->compute_stream();
+  stream_ = kernel_runtime->communication_stream();
+
+  MS_EXCEPTION_IF_NULL(pre_event_);
+  MS_EXCEPTION_IF_NULL(post_event_);
+  pre_event_->set_wait_stream(stream_);
+  pre_event_->set_record_stream(compute_stream_);
+  post_event_->set_wait_stream(compute_stream_);
+  post_event_->set_record_stream(stream_);
+}
+}  // namespace mindspore::device::ascend
diff --git a/mindspore/ccsrc/runtime/device/ascend/ascend_bucket.h b/mindspore/ccsrc/runtime/device/ascend/ascend_bucket.h
new file mode 100644
index 00000000000..f4db7909c1d
--- /dev/null
+++ b/mindspore/ccsrc/runtime/device/ascend/ascend_bucket.h
@@ -0,0 +1,38 @@
+/**
+ * Copyright 2021 Huawei Technologies Co., Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MINDSPORE_MINDSPORE_CCSRC_RUNTIME_DEVICE_ASCEND_ASCEND_BUCKET_H_
+#define MINDSPORE_MINDSPORE_CCSRC_RUNTIME_DEVICE_ASCEND_ASCEND_BUCKET_H_
+
+#include "runtime/device/bucket.h"
+
+namespace mindspore::device::ascend {
+class AscendBucket : public Bucket {
+ public:
+  AscendBucket(uint32_t id, uint32_t bucket_size) : Bucket(id, bucket_size) {}
+  ~AscendBucket() override = default;
+
+  void Init() override;
+
+ private:
+  void AllocateAllReduceAddr() override;
+  void FreeAllDeviceMem() override;
+  void FreeDeviceMem(void *dev_ptr) override;
+  void CopyTensorToContiguousMemory() override;
+  void LaunchAllReduce() override;
+};
+}  // namespace mindspore::device::ascend
+#endif  // MINDSPORE_MINDSPORE_CCSRC_RUNTIME_DEVICE_ASCEND_ASCEND_BUCKET_H_
diff --git a/mindspore/ccsrc/runtime/device/ascend/ascend_event.cc b/mindspore/ccsrc/runtime/device/ascend/ascend_event.cc
new file mode 100644
index 00000000000..676b311244c
--- /dev/null
+++ b/mindspore/ccsrc/runtime/device/ascend/ascend_event.cc
@@ -0,0 +1,60 @@
+/**
+ * Copyright 2021 Huawei Technologies Co., Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "runtime/device/ascend/ascend_event.h"
+
+#include "runtime/event.h"
+#include "runtime/stream.h"
+#include "utils/log_adapter.h"
+
+namespace mindspore::device::ascend {
+AscendEvent::AscendEvent() {
+  auto ret = rtEventCreate(&event_);
+  if (ret != RT_ERROR_NONE) {
+    MS_LOG(ERROR) << "rtEventCreate failed, ret:" << ret;
+    event_ = nullptr;
+  }
+}
+
+AscendEvent::~AscendEvent() {
+  auto ret = rtEventDestroy(event_);
+  if (ret != RT_ERROR_NONE) {
+    MS_LOG(ERROR) << "rtEventDestory failed, ret:" << ret;
+  }
+}
+
+void AscendEvent::RecordEvent() {
+  MS_EXCEPTION_IF_NULL(event_);
+  MS_EXCEPTION_IF_NULL(record_stream_);
+  auto ret = rtEventRecord(event_, record_stream_);
+  if (ret != RT_ERROR_NONE) {
+    MS_LOG(EXCEPTION) << "rtEventRecord failed, ret:" << ret;
+  }
+  need_wait_ = true;
+}
+
+void AscendEvent::WaitEvent() {
+  MS_EXCEPTION_IF_NULL(event_);
+  MS_EXCEPTION_IF_NULL(wait_stream_);
+  auto ret = rtStreamWaitEvent(wait_stream_, event_);
+  if (ret != RT_ERROR_NONE) {
+    MS_LOG(EXCEPTION) << "rtStreamWaitEvent failed, ret:" << ret;
+  }
+  need_wait_ = false;
+}
+
+bool AscendEvent::NeedWait() { return need_wait_; }
+}  // namespace mindspore::device::ascend
diff --git a/mindspore/ccsrc/runtime/device/ascend/ascend_event.h b/mindspore/ccsrc/runtime/device/ascend/ascend_event.h
new file mode 100644
index 00000000000..059390e8c92
--- /dev/null
+++ b/mindspore/ccsrc/runtime/device/ascend/ascend_event.h
@@ -0,0 +1,41 @@
+/**
+ * Copyright 2021 Huawei Technologies Co., Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MINDSPORE_ASCEND_EVENT_H
+#define MINDSPORE_ASCEND_EVENT_H
+
+#include "runtime/base.h"
+#include "ir/device_event.h"
+namespace mindspore::device::ascend {
+class AscendEvent : public DeviceEvent {
+ public:
+  AscendEvent();
+  ~AscendEvent() override;
+
+  void WaitEvent() override;
+  void RecordEvent() override;
+  bool NeedWait() override;
+  void set_wait_stream(rtStream_t wait_stream) override { wait_stream_ = wait_stream; }
+  void set_record_stream(rtStream_t record_stream) override { record_stream_ = record_stream; }
+
+ private:
+  rtEvent_t event_{nullptr};
+  rtStream_t wait_stream_{nullptr};
+  rtStream_t record_stream_{nullptr};
+  bool need_wait_{false};
+};
+}  // namespace mindspore::device::ascend
+#endif  // MINDSPORE_ASCEND_EVENT_H
diff --git a/mindspore/ccsrc/runtime/device/ascend/ascend_kernel_runtime.cc b/mindspore/ccsrc/runtime/device/ascend/ascend_kernel_runtime.cc
index 0432b77ba30..87a2fdc382f 100644
--- a/mindspore/ccsrc/runtime/device/ascend/ascend_kernel_runtime.cc
+++ b/mindspore/ccsrc/runtime/device/ascend/ascend_kernel_runtime.cc
@@ -718,6 +718,10 @@ bool AscendKernelRuntime::SyncStream() {
     MS_LOG(ERROR) << "Call runtime rtStreamSynchronize error.";
     return false;
   }
+  if (RT_ERROR_NONE != rtStreamSynchronize(communication_stream_)) {  // o for switch stream
+    MS_LOG(ERROR) << "Call runtime rtStreamSynchronize error.";
+    return false;
+  }
   FreeAndClearBufferPtrs();
   return true;
 }
@@ -786,6 +790,10 @@ bool AscendKernelRuntime::InitDevice() {
   if (ret != RT_ERROR_NONE) {
     MS_LOG(EXCEPTION) << "Call rtStreamCreate, ret[" << ret << "]";
   }
+  ret = rtStreamCreate(&communication_stream_, 0);
+  if (ret != RT_ERROR_NONE) {
+    MS_LOG(EXCEPTION) << "create communication stream failed, ret:" << ret;
+  }
   return true;
 }
 
@@ -799,6 +807,14 @@ bool AscendKernelRuntime::ResetDevice(uint32_t device_id) {
     stream_ = nullptr;
   }
 
+  if (communication_stream_ != nullptr) {
+    auto ret = rtStreamDestroy(communication_stream_);
+    if (ret != RT_ERROR_NONE) {
+      MS_LOG(EXCEPTION) << "Call rtStreamDestroy, ret[" << ret << "]";
+    }
+    communication_stream_ = nullptr;
+  }
+
   auto ret = rtDeviceReset(device_id);
   if (ret != RT_ERROR_NONE) {
     MS_EXCEPTION(DeviceProcessError) << "Call rtDeviceReset, ret[" << ret << "]";
@@ -919,4 +935,5 @@ uint64_t AscendKernelRuntime::GetAvailableMemMaxSize() const {
   auto ascend_mem_manager = dynamic_pointer_cast<AscendMemoryManager>(mem_manager_);
   return ascend_mem_manager->GetDeviceMemSize();
 }
+
 }  // namespace mindspore::device::ascend
diff --git a/mindspore/ccsrc/runtime/device/ascend/ascend_kernel_runtime.h b/mindspore/ccsrc/runtime/device/ascend/ascend_kernel_runtime.h
index ccbf2de596c..b37c74de46f 100644
--- a/mindspore/ccsrc/runtime/device/ascend/ascend_kernel_runtime.h
+++ b/mindspore/ccsrc/runtime/device/ascend/ascend_kernel_runtime.h
@@ -57,6 +57,8 @@ class AscendKernelRuntime : public KernelRuntime {
   void *context() const override { return rt_context_; }
   void PreInit() override;
   uint64_t GetAvailableMemMaxSize() const override;
+  void *compute_stream() const override { return stream_; }
+  void *communication_stream() const override { return communication_stream_; }
 
  protected:
   DeviceAddressPtr CreateDeviceAddress(void *device_ptr, size_t device_size, const string &format,
diff --git a/mindspore/ccsrc/runtime/device/ascend/ascend_memory_manager.cc b/mindspore/ccsrc/runtime/device/ascend/ascend_memory_manager.cc
index 24cdeb31a1b..9ab638f8e0f 100644
--- a/mindspore/ccsrc/runtime/device/ascend/ascend_memory_manager.cc
+++ b/mindspore/ccsrc/runtime/device/ascend/ascend_memory_manager.cc
@@ -162,6 +162,14 @@ void AscendMemoryManager::MallocSomasDynamicMem(const session::KernelGraph *grap
     somas_reuse_util_ptr_->ConvertToProfilingNode(graph->graph_id());
   }
 }
+
+// communication memory: [512align_size + data + 512align_size]
+// return the pointer to the start of data address.
+uint8_t *AscendMemoryManager::MallocCommunicationMemFromMemPool(size_t size) {
+  auto align_size = GetCommunicationAlignSize(size);
+  uint8_t *base_ptr = reinterpret_cast<uint8_t *>(AscendMemoryPool::GetInstance().AllocTensorMem(align_size));
+  return base_ptr + kMemAlignSize;
+}
 }  // namespace ascend
 }  // namespace device
 }  // namespace mindspore
diff --git a/mindspore/ccsrc/runtime/device/ascend/ascend_memory_manager.h b/mindspore/ccsrc/runtime/device/ascend/ascend_memory_manager.h
index 14f5f29f938..35b8711cb56 100644
--- a/mindspore/ccsrc/runtime/device/ascend/ascend_memory_manager.h
+++ b/mindspore/ccsrc/runtime/device/ascend/ascend_memory_manager.h
@@ -33,6 +33,7 @@ class AscendMemoryManager : public MemoryManager {
   void *MallocMemFromMemPool(size_t size) override;
   uint64_t GetDeviceMemSize();
   void MallocSomasDynamicMem(const session::KernelGraph *graph);
+  uint8_t *MallocCommunicationMemFromMemPool(size_t size) override;
 
  protected:
   uint8_t *MallocStaticMem(size_t size, bool communication_mem, uint32_t graph_id = kInvalidGraphId) override;
diff --git a/mindspore/ccsrc/runtime/device/bucket.cc b/mindspore/ccsrc/runtime/device/bucket.cc
new file mode 100644
index 00000000000..626180aba40
--- /dev/null
+++ b/mindspore/ccsrc/runtime/device/bucket.cc
@@ -0,0 +1,106 @@
+/**
+ * Copyright 2021 Huawei Technologies Co., Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "runtime/device/bucket.h"
+
+#include <memory>
+#include "runtime/device/kernel_runtime_manager.h"
+#include "utils/profile.h"
+
+namespace mindspore::device {
+void Bucket::AddGradTensor(const tensor::TensorPtr &tensor) {
+  if (grad_tensor_list_.size() >= bucket_size_) {
+    MS_LOG(EXCEPTION) << "bucket is full";
+  }
+  grad_tensor_list_.emplace_back(tensor);
+  if (grad_tensor_list_.size() > bucket_size_) {
+    MS_LOG(EXCEPTION) << "too many tensor add to the bucket, bucket_size_:" << bucket_size_
+                      << " total tensor size:" << grad_tensor_list_.size();
+  }
+  MS_LOG(INFO) << "current bucket tensors size:" << grad_tensor_list_.size();
+  // bucket is full, start to launch allreduce
+  if (grad_tensor_list_.size() == bucket_size_) {
+    full_ = true;
+  }
+}
+
+void Bucket::Launch() {
+  auto start = GetTime();
+  if (grad_tensor_list_.size() != bucket_size_) {
+    MS_LOG(EXCEPTION) << "Bucket is not full, grad_tensor_list_ size:" << grad_tensor_list_.size()
+                      << " bucket_size_:" << bucket_size_;
+  }
+  MS_LOG(INFO) << "Bucket is full, start to launch AllReduce";
+  MS_EXCEPTION_IF_NULL(pre_event_);
+  MS_EXCEPTION_IF_NULL(post_event_);
+  AllocateAllReduceAddr();
+  CopyTensorToContiguousMemory();
+  pre_event_->RecordEvent();
+  pre_event_->WaitEvent();
+  LaunchAllReduce();
+  post_event_->RecordEvent();
+  UpdateTensorAddr();
+  // pass event to the tensor
+  for (auto &tensor : grad_tensor_list_) {
+    MS_EXCEPTION_IF_NULL(tensor);
+    tensor->SetDeviceEvent(post_event_);
+  }
+  MS_LOG(INFO) << "Bucket launch cost:" << (GetTime() - start) * 1e6 << " us";
+}
+
+// TODO(caifubi): float16 grad cast to float32 grad
+
+void Bucket::UpdateTensorAddr() {
+  if (grad_tensor_list_.size() != bucket_size_ || new_tensor_output_addrs_.size() != bucket_size_) {
+    MS_LOG(EXCEPTION) << "grad_tensor_list size:" << grad_tensor_list_.size()
+                      << " tensor output addr size:" << new_tensor_output_addrs_.size()
+                      << " bucket size:" << bucket_size_;
+  }
+
+  for (size_t i = 0; i < bucket_size_; ++i) {
+    auto &tensor = grad_tensor_list_[i];
+    MS_EXCEPTION_IF_NULL(tensor);
+    auto device_address = std::dynamic_pointer_cast<DeviceAddress>(tensor->device_address());
+    // release old addr and manage addr by this Bucket.
+    MS_EXCEPTION_IF_NULL(device_address);
+    auto origin_dev_ptr = device_address->GetMutablePtr();
+    // FreeDeviceMem(origin_dev_ptr);
+    tensor_old_addr_list_.emplace_back(origin_dev_ptr);
+    device_address->from_mem_pool_ = false;
+    device_address->set_ptr(new_tensor_output_addrs_[i]);
+  }
+}
+
+void Bucket::LazyDeleteOldAddr() {
+  MS_LOG(INFO) << "Lazy delete old grad address";
+  for (auto old_addr : tensor_old_addr_list_) {
+    FreeDeviceMem(old_addr);
+  }
+  tensor_old_addr_list_.clear();
+}
+
+void Bucket::Release() {
+  MS_LOG(INFO) << "Clear bucket:" << id_;
+  grad_tensor_list_.clear();
+  new_tensor_output_addrs_.clear();
+  memcpy_input_addrs_.clear();
+  memcpy_output_addrs_.clear();
+  tensor_type_list_.clear();
+  LazyDeleteOldAddr();
+  FreeAllDeviceMem();
+  full_ = false;
+}
+}  // namespace mindspore::device
diff --git a/mindspore/ccsrc/runtime/device/bucket.h b/mindspore/ccsrc/runtime/device/bucket.h
new file mode 100644
index 00000000000..3fe2f6f4ce7
--- /dev/null
+++ b/mindspore/ccsrc/runtime/device/bucket.h
@@ -0,0 +1,83 @@
+/**
+ * Copyright 2021 Huawei Technologies Co., Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MINDSPORE_MINDSPORE_CCSRC_RUNTIME_DEVICE_BUCKET_H_
+#define MINDSPORE_MINDSPORE_CCSRC_RUNTIME_DEVICE_BUCKET_H_
+
+#include <vector>
+#include <utility>
+#include <string>
+#include <memory>
+#include "ir/anf.h"
+#include "ir/device_event.h"
+#include "runtime/device/device_address.h"
+#include "backend/session/kernel_graph.h"
+
+namespace mindspore::device {
+class Bucket {
+ public:
+  Bucket(uint32_t id, uint32_t bucket_size)
+      : id_(id),
+        bucket_size_(bucket_size),
+        full_(false),
+        stream_(nullptr),
+        compute_stream_(nullptr),
+        pre_event_(nullptr),
+        post_event_(nullptr),
+        total_size_(0),
+        ar_input_addr_(nullptr),
+        ar_output_addr_(nullptr) {}
+  virtual ~Bucket() = default;
+
+  uint32_t id() const { return id_; }
+  bool full() const { return full_; }
+  void Launch();
+  void Release();
+  void AddGradTensor(const tensor::TensorPtr &tensor);
+  virtual void Init() = 0;
+
+ protected:
+  uint32_t id_;
+  uint32_t bucket_size_;
+  bool full_;
+  void *stream_;
+  void *compute_stream_;
+
+  std::shared_ptr<DeviceEvent> pre_event_;
+  std::shared_ptr<DeviceEvent> post_event_;
+
+  size_t total_size_;
+  uint8_t *ar_input_addr_;
+  uint8_t *ar_output_addr_;
+  std::string group_;
+  std::vector<tensor::TensorPtr> grad_tensor_list_;
+  std::vector<uint8_t *> new_tensor_output_addrs_;
+  std::vector<kernel::AddressPtr> memcpy_input_addrs_;
+  std::vector<kernel::AddressPtr> memcpy_output_addrs_;
+  std::vector<TypeId> tensor_type_list_;
+  std::vector<void *> tensor_old_addr_list_;
+
+  virtual void AllocateAllReduceAddr() = 0;
+  void UpdateTensorAddr();
+  virtual void LaunchAllReduce() = 0;
+  virtual void FreeAllDeviceMem() = 0;
+  virtual void FreeDeviceMem(void *dev_ptr) = 0;
+  virtual void CopyTensorToContiguousMemory() = 0;
+  void LazyDeleteOldAddr();
+};
+}  // namespace mindspore::device
+
+#endif  // MINDSPORE_MINDSPORE_CCSRC_RUNTIME_DEVICE_BUCKET_H_
diff --git a/mindspore/ccsrc/runtime/device/device_address.h b/mindspore/ccsrc/runtime/device/device_address.h
index 8de942fd8bc..a3cc13f0c7b 100644
--- a/mindspore/ccsrc/runtime/device/device_address.h
+++ b/mindspore/ccsrc/runtime/device/device_address.h
@@ -26,6 +26,7 @@
 
 namespace mindspore {
 namespace device {
+class Bucket;
 namespace cpu {
 class CPUSimpleMemPlan;
 class CPUMemoryManager;
@@ -100,6 +101,7 @@ class DeviceAddress : public mindspore::DeviceSync {
   friend class mindspore::device::ascend::AscendKernelRuntime;
   friend class mindspore::device::ascend::AscendMemoryManager;
   friend class mindspore::device::ascend::DataDumper;
+  friend class mindspore::device::Bucket;
 };
 
 using DeviceAddressPtr = std::shared_ptr<DeviceAddress>;
diff --git a/mindspore/ccsrc/runtime/device/gpu/gpu_bucket.cc b/mindspore/ccsrc/runtime/device/gpu/gpu_bucket.cc
new file mode 100644
index 00000000000..48215ef3864
--- /dev/null
+++ b/mindspore/ccsrc/runtime/device/gpu/gpu_bucket.cc
@@ -0,0 +1,177 @@
+/**
+ * Copyright 2021 Huawei Technologies Co., Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "runtime/device/gpu/gpu_bucket.h"
+
+#include <cuda_runtime_api.h>
+#include <nccl.h>
+#include <vector>
+#include <memory>
+#include "abstract/utils.h"
+#include "runtime/device/gpu/gpu_event.h"
+#include "runtime/device/gpu/gpu_memory_allocator.h"
+#include "runtime/device/gpu/gpu_device_manager.h"
+#include "runtime/device/kernel_runtime_manager.h"
+#include "runtime/device/gpu/distribution/collective_init.h"
+#include "backend/kernel_compiler/gpu/nccl/nccl_gpu_kernel.h"
+#include "runtime/device/gpu/gpu_common.h"
+
+namespace {
+const size_t kCommunicationMemAlignSize = 16;
+size_t AlignMemorySize(size_t size) {
+  if (size == 0) {
+    return kCommunicationMemAlignSize;
+  }
+  return ((size + kCommunicationMemAlignSize - 1) / kCommunicationMemAlignSize) * kCommunicationMemAlignSize;
+}
+}  // namespace
+namespace mindspore::device::gpu {
+GPUBucket::GPUBucket(uint32_t id, uint32_t bucket_size) : Bucket(id, bucket_size), collective_handle_(nullptr) {
+  group_ = kNcclWorldGroup;
+}
+
+void GPUBucket::AllocateAllReduceAddr() {
+  MS_LOG(INFO) << "start";
+  if (grad_tensor_list_.size() != bucket_size_) {
+    MS_LOG(EXCEPTION) << "grad tensor list size:" << grad_tensor_list_.size()
+                      << " is not equal to bucket size:" << bucket_size_;
+  }
+
+  auto total_size = 0;
+  std::vector<size_t> size_list;
+  std::vector<size_t> align_size_list;
+  for (auto &tensor : grad_tensor_list_) {
+    MS_EXCEPTION_IF_NULL(tensor);
+    tensor_type_list_.emplace_back(tensor->data_type());
+    DeviceAddressPtr device_address = std::dynamic_pointer_cast<DeviceAddress>(tensor->device_address());
+    MS_EXCEPTION_IF_NULL(device_address);
+    auto origin_size = device_address->GetSize();
+    auto align_size = AlignMemorySize(origin_size);
+    size_list.emplace_back(origin_size);
+    align_size_list.emplace_back(align_size);
+    total_size += align_size;
+    memcpy_input_addrs_.emplace_back(
+      std::make_shared<kernel::Address>(static_cast<uint8_t *>(device_address->GetMutablePtr()), origin_size));
+  }
+  total_size_ = total_size;
+
+  ar_input_addr_ = static_cast<uint8_t *>(GPUMemoryAllocator::GetInstance().AllocTensorMem(total_size));
+  ar_output_addr_ = static_cast<uint8_t *>(GPUMemoryAllocator::GetInstance().AllocTensorMem(total_size));
+
+  uint8_t *memcpy_output = ar_input_addr_;
+  for (size_t i = 0; i < bucket_size_; ++i) {
+    memcpy_output_addrs_.emplace_back(std::make_shared<kernel::Address>(memcpy_output, size_list[i]));
+    memcpy_output += align_size_list[i];
+  }
+
+  uint8_t *tensor_output = ar_output_addr_;
+  for (size_t i = 0; i < bucket_size_; ++i) {
+    new_tensor_output_addrs_.emplace_back(tensor_output);
+    tensor_output += align_size_list[i];
+  }
+  MS_LOG(INFO) << "end";
+}
+
+void GPUBucket::FreeDeviceMem(void *dev_ptr) { GPUMemoryAllocator::GetInstance().FreeTensorMem(dev_ptr); }
+
+void GPUBucket::FreeAllDeviceMem() {
+  MS_LOG(INFO) << "start";
+  if (ar_input_addr_ != nullptr) {
+    FreeDeviceMem(ar_input_addr_);
+    ar_input_addr_ = nullptr;
+  }
+  if (ar_output_addr_ != nullptr) {
+    FreeDeviceMem(ar_output_addr_);
+    ar_output_addr_ = nullptr;
+  }
+  MS_LOG(INFO) << "end";
+}
+
+void GPUBucket::CopyTensorToContiguousMemory() {
+  MS_LOG(INFO) << "start";
+  MS_EXCEPTION_IF_NULL(compute_stream_);
+  // Clean allreduce input
+  CHECK_CUDA_RET_WITH_EXCEPT_NOTRACE(
+    cudaMemsetAsync(ar_input_addr_, 0, total_size_, static_cast<cudaStream_t>(compute_stream_)),
+    "Call cudaMemsetAsync failed");
+
+  for (size_t i = 0; i < bucket_size_; ++i) {
+    MS_EXCEPTION_IF_NULL(memcpy_output_addrs_[i]);
+    MS_EXCEPTION_IF_NULL(memcpy_input_addrs_[i]);
+    if (!GPUDeviceManager::GetInstance().CopyDeviceMemToDeviceAsync(memcpy_output_addrs_[i]->addr,
+                                                                    memcpy_input_addrs_[i]->addr,
+                                                                    memcpy_output_addrs_[i]->size, compute_stream_)) {
+      MS_LOG(EXCEPTION) << "Copy memory failed";
+    }
+  }
+  MS_LOG(INFO) << "end";
+}
+
+void GPUBucket::LaunchAllReduce() {
+  MS_LOG(INFO) << "start";
+  collective_handle_ = device::gpu::CollectiveInitializer::instance().collective_handle();
+  auto all_reduce_funcptr =
+    reinterpret_cast<kernel::AllReduce>(dlsym(const_cast<void *>(collective_handle_), "AllReduce"));
+  MS_EXCEPTION_IF_NULL(all_reduce_funcptr);
+  MS_EXCEPTION_IF_NULL(stream_);
+
+  if (tensor_type_list_.empty()) {
+    MS_LOG(EXCEPTION) << "No tesnor type found";
+  }
+  auto type = tensor_type_list_[0];
+  if (std::any_of(tensor_type_list_.begin(), tensor_type_list_.end(),
+                  [&type](TypeId tensor_type) { return type != tensor_type; })) {
+    MS_LOG(EXCEPTION) << "AllReduce input have different dtype";
+  }
+
+  auto type_size = abstract::TypeIdSize(type);
+  if (type_size == 0) {
+    MS_LOG(EXCEPTION) << "Invalid type:" << type;
+  }
+
+  // typeid to nccl_data_type
+  auto nccl_data_type_iter = kernel::kNcclDtypeMap.find(TypeIdLabel(type));
+  if (nccl_data_type_iter == kernel::kNcclDtypeMap.end()) {
+    MS_LOG(EXCEPTION) << "Invalid type:" << type;
+  }
+
+  auto nccl_result =
+    (*all_reduce_funcptr)(ar_input_addr_, ar_output_addr_, total_size_ / type_size, nccl_data_type_iter->second,
+                          ncclRedOp_t::ncclSum, static_cast<cudaStream_t>(stream_), group_);
+  if (nccl_result != ncclSuccess) {
+    MS_LOG(EXCEPTION) << "AllReduce failed, ret:" << nccl_result;
+  }
+
+  MS_LOG(INFO) << "end";
+}
+
+void GPUBucket::Init() {
+  pre_event_ = std::make_shared<GpuEvent>();
+  post_event_ = std::make_shared<GpuEvent>();
+
+  auto kernel_runtime = KernelRuntimeManager::Instance().GetCurrentKernelRuntime();
+  MS_EXCEPTION_IF_NULL(kernel_runtime);
+  stream_ = kernel_runtime->communication_stream();
+  compute_stream_ = kernel_runtime->compute_stream();
+
+  MS_EXCEPTION_IF_NULL(pre_event_);
+  MS_EXCEPTION_IF_NULL(post_event_);
+  pre_event_->set_record_stream(compute_stream_);
+  pre_event_->set_wait_stream(stream_);
+  post_event_->set_record_stream(stream_);
+  post_event_->set_wait_stream(compute_stream_);
+}
+}  // namespace mindspore::device::gpu
diff --git a/mindspore/ccsrc/runtime/device/gpu/gpu_bucket.h b/mindspore/ccsrc/runtime/device/gpu/gpu_bucket.h
new file mode 100644
index 00000000000..d10d2b5d974
--- /dev/null
+++ b/mindspore/ccsrc/runtime/device/gpu/gpu_bucket.h
@@ -0,0 +1,40 @@
+/**
+ * Copyright 2021 Huawei Technologies Co., Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MINDSPORE_MINDSPORE_CCSRC_RUNTIME_DEVICE_GPU_GPU_BUCKET_H_
+#define MINDSPORE_MINDSPORE_CCSRC_RUNTIME_DEVICE_GPU_GPU_BUCKET_H_
+
+#include "runtime/device/bucket.h"
+
+namespace mindspore::device::gpu {
+class GPUBucket : public Bucket {
+ public:
+  GPUBucket(uint32_t id, uint32_t bucket_size);
+  ~GPUBucket() override = default;
+
+  void Init() override;
+
+ private:
+  void AllocateAllReduceAddr() override;
+  void FreeAllDeviceMem() override;
+  void FreeDeviceMem(void *dev_ptr) override;
+  void CopyTensorToContiguousMemory() override;
+  void LaunchAllReduce() override;
+
+  const void *collective_handle_;
+};
+}  // namespace mindspore::device::gpu
+#endif  // MINDSPORE_MINDSPORE_CCSRC_RUNTIME_DEVICE_GPU_GPU_BUCKET_H_
diff --git a/mindspore/ccsrc/runtime/device/gpu/gpu_event.cc b/mindspore/ccsrc/runtime/device/gpu/gpu_event.cc
new file mode 100644
index 00000000000..41ead402a70
--- /dev/null
+++ b/mindspore/ccsrc/runtime/device/gpu/gpu_event.cc
@@ -0,0 +1,46 @@
+/**
+ * Copyright 2021 Huawei Technologies Co., Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "runtime/device/gpu/gpu_event.h"
+#include "runtime/device/gpu/gpu_common.h"
+
+namespace mindspore::device::gpu {
+GpuEvent::GpuEvent() {
+  auto ret = cudaEventCreate(&event_);
+  if (ret != cudaSuccess) {
+    MS_LOG(ERROR) << "cudaEventCreate failed, ret:" << ret;
+    event_ = nullptr;
+  }
+}
+
+GpuEvent::~GpuEvent() { CHECK_CUDA_RET_WITH_ERROR_NOTRACE(cudaEventDestroy(event_), "cudaEventDestory failed"); }
+
+void GpuEvent::WaitEvent() {
+  MS_EXCEPTION_IF_NULL(wait_stream_);
+  MS_EXCEPTION_IF_NULL(event_);
+  CHECK_CUDA_RET_WITH_EXCEPT_NOTRACE(cudaStreamWaitEvent(wait_stream_, event_, 0), "cudaStreamWaitEvent failed");
+  need_wait_ = false;
+}
+
+void GpuEvent::RecordEvent() {
+  MS_EXCEPTION_IF_NULL(event_);
+  MS_EXCEPTION_IF_NULL(record_stream_);
+  CHECK_CUDA_RET_WITH_EXCEPT_NOTRACE(cudaEventRecord(event_, record_stream_), "cudaEventRecord failed");
+  need_wait_ = true;
+}
+
+bool GpuEvent::NeedWait() { return need_wait_; }
+}  // namespace mindspore::device::gpu
diff --git a/mindspore/ccsrc/runtime/device/gpu/gpu_event.h b/mindspore/ccsrc/runtime/device/gpu/gpu_event.h
new file mode 100644
index 00000000000..a5cd50e0be0
--- /dev/null
+++ b/mindspore/ccsrc/runtime/device/gpu/gpu_event.h
@@ -0,0 +1,42 @@
+/**
+ * Copyright 2021 Huawei Technologies Co., Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MINDSPORE_MINDSPORE_CCSRC_RUNTIME_DEVICE_GPU_GPU_EVENT_H_
+#define MINDSPORE_MINDSPORE_CCSRC_RUNTIME_DEVICE_GPU_GPU_EVENT_H_
+
+#include <cuda_runtime_api.h>
+#include "ir/device_event.h"
+
+namespace mindspore::device::gpu {
+class GpuEvent : public DeviceEvent {
+ public:
+  GpuEvent();
+  ~GpuEvent() override;
+
+  void WaitEvent() override;
+  void RecordEvent() override;
+  bool NeedWait() override;
+  void set_wait_stream(void *wait_stream) override { wait_stream_ = static_cast<cudaStream_t>(wait_stream); }
+  void set_record_stream(void *record_stream) override { record_stream_ = static_cast<cudaStream_t>(record_stream); }
+
+ private:
+  cudaEvent_t event_{nullptr};
+  cudaStream_t wait_stream_{nullptr};
+  cudaStream_t record_stream_{nullptr};
+  bool need_wait_{false};
+};
+}  // namespace mindspore::device::gpu
+#endif  // MINDSPORE_MINDSPORE_CCSRC_RUNTIME_DEVICE_GPU_GPU_EVENT_H_
diff --git a/mindspore/ccsrc/runtime/device/gpu/gpu_kernel_runtime.cc b/mindspore/ccsrc/runtime/device/gpu/gpu_kernel_runtime.cc
index 510161b50ec..ec0c34ea6f3 100644
--- a/mindspore/ccsrc/runtime/device/gpu/gpu_kernel_runtime.cc
+++ b/mindspore/ccsrc/runtime/device/gpu/gpu_kernel_runtime.cc
@@ -229,6 +229,11 @@ bool GPUKernelRuntime::InitDevice() {
     MS_LOG(ERROR) << "No default CUDA stream found.";
     return false;
   }
+  GPUDeviceManager::GetInstance().CreateStream(&communication_stream_);
+  if (communication_stream_ == nullptr) {
+    MS_LOG(ERROR) << "Invalid communication stream";
+    return false;
+  }
   return true;
 }
 
@@ -1251,6 +1256,7 @@ session::KernelWithIndex GPUKernelRuntime::GetPrevNodeOutput(const AnfNodePtr &n
 
   return addr_iter->second[i];
 }
+
 }  // namespace gpu
 }  // namespace device
 }  // namespace mindspore
diff --git a/mindspore/ccsrc/runtime/device/gpu/gpu_kernel_runtime.h b/mindspore/ccsrc/runtime/device/gpu/gpu_kernel_runtime.h
index 1813c23b667..b57021effa4 100644
--- a/mindspore/ccsrc/runtime/device/gpu/gpu_kernel_runtime.h
+++ b/mindspore/ccsrc/runtime/device/gpu/gpu_kernel_runtime.h
@@ -47,6 +47,8 @@ class GPUKernelRuntime : public KernelRuntime {
   bool Run(session::KernelGraph *graph, bool is_task_sink) override;
   bool GenDynamicKernel(const session::KernelGraph *graph) override { return true; }
   bool RunDynamicKernelAsync(const session::KernelGraph *graph) override { return true; }
+  void *compute_stream() const override { return stream_; }
+  void *communication_stream() const override { return communication_stream_; }
 
  protected:
   DeviceAddressPtr CreateDeviceAddress(void *device_ptr, size_t device_size, const string &format,
diff --git a/mindspore/ccsrc/runtime/device/kernel_runtime.cc b/mindspore/ccsrc/runtime/device/kernel_runtime.cc
index d64967cea7c..96765ccc77e 100644
--- a/mindspore/ccsrc/runtime/device/kernel_runtime.cc
+++ b/mindspore/ccsrc/runtime/device/kernel_runtime.cc
@@ -946,11 +946,13 @@ bool KernelRuntime::LaunchKernelMod(const session::KernelGraph &graph) {
       AddressPtrList kernel_workspaces;
       AddressPtrList kernel_outputs;
       GenLaunchArgs(*kernel_mod, kernel, &kernel_inputs, &kernel_workspaces, &kernel_outputs);
+
       auto ret = kernel_mod->Launch(kernel_inputs, kernel_workspaces, kernel_outputs, stream_);
       if (!ret) {
         MS_LOG(ERROR) << "Launch kernel failed.";
         return false;
       }
+
       KernelLaunchProfiling(kernels[i]->fullname_with_scope());
     }
   }
diff --git a/mindspore/ccsrc/runtime/device/kernel_runtime.h b/mindspore/ccsrc/runtime/device/kernel_runtime.h
index df12b002aa0..124d2942f6e 100644
--- a/mindspore/ccsrc/runtime/device/kernel_runtime.h
+++ b/mindspore/ccsrc/runtime/device/kernel_runtime.h
@@ -33,6 +33,7 @@
 #include "utils/ms_context.h"
 #include "runtime/device/memory_manager.h"
 #include "runtime/device/executor/dynamic_kernel.h"
+#include "ir/device_event.h"
 
 using mindspore::tensor::Tensor;
 using std::vector;
@@ -83,6 +84,9 @@ class KernelRuntime {
   uint8_t *MallocMem(MemType type, size_t size, const DeviceAddressPtr &address) {
     return mem_manager_->MallocMem(type, size, address);
   }
+  uint8_t *MallocCommunicationMemFromMemPool(size_t size) {
+    return mem_manager_->MallocCommunicationMemFromMemPool(size);
+  }
   static void GenLaunchArgs(const mindspore::kernel::KernelMod &kernel_mod, const AnfNodePtr &kernel,
                             AddressPtrList *kernel_inputs, AddressPtrList *kernel_workspaces,
                             AddressPtrList *kernel_outputs);
@@ -104,6 +108,8 @@ class KernelRuntime {
   virtual uint64_t GetAvailableMemMaxSize() const { return 0; }
   void AddBufferPtr(std::shared_ptr<char[]> ptr) { buffer_ptrs_.push_back(ptr); }
   void FreeAndClearBufferPtrs() { buffer_ptrs_.clear(); }
+  virtual void *compute_stream() const { return nullptr; }
+  virtual void *communication_stream() const { return nullptr; }
 
  protected:
   virtual DeviceAddressPtr CreateDeviceAddress(void *device_ptr, size_t device_size, const string &format,
@@ -149,7 +155,8 @@ class KernelRuntime {
 #if !defined(_WIN32) && !defined(_WIN64)
   std::shared_ptr<Debugger> debugger_;
 #endif
-  void *stream_ = nullptr;
+  void *stream_{nullptr};
+  void *communication_stream_{nullptr};
   std::shared_ptr<MemoryManager> mem_manager_{nullptr};
   std::map<uint32_t, std::vector<DynamicKernelPtr>> graph_dynamic_kernel_map_;
   std::vector<std::shared_ptr<char[]>> buffer_ptrs_ = {};
diff --git a/mindspore/ccsrc/runtime/device/kernel_runtime_manager.cc b/mindspore/ccsrc/runtime/device/kernel_runtime_manager.cc
index a3677bf15ef..c19a0268602 100644
--- a/mindspore/ccsrc/runtime/device/kernel_runtime_manager.cc
+++ b/mindspore/ccsrc/runtime/device/kernel_runtime_manager.cc
@@ -106,6 +106,14 @@ KernelRuntime *KernelRuntimeManager::GetKernelRuntime(const std::string &device_
   return kernel_runtime.get();
 }
 
+KernelRuntime *KernelRuntimeManager::GetCurrentKernelRuntime() {
+  auto ms_context = MsContext::GetInstance();
+  MS_EXCEPTION_IF_NULL(ms_context);
+  uint32_t device_id = ms_context->get_param<uint32_t>(MS_CTX_DEVICE_ID);
+  std::string device_name = ms_context->get_param<std::string>(MS_CTX_DEVICE_TARGET);
+  return GetKernelRuntime(device_name, device_id);
+}
+
 void KernelRuntimeManager::ReleaseKernelRuntime(const std::string &device_name, uint32_t device_id) {
   std::string runtime_key = GetDeviceKey(device_name, device_id);
   std::lock_guard<std::mutex> guard(lock_);
diff --git a/mindspore/ccsrc/runtime/device/kernel_runtime_manager.h b/mindspore/ccsrc/runtime/device/kernel_runtime_manager.h
index 31dec77eefa..416f0759279 100644
--- a/mindspore/ccsrc/runtime/device/kernel_runtime_manager.h
+++ b/mindspore/ccsrc/runtime/device/kernel_runtime_manager.h
@@ -38,6 +38,7 @@ class KernelRuntimeManager {
   }
   void Register(const std::string &device_name, KernelRuntimeCreator &&runtime_creator);
   KernelRuntime *GetKernelRuntime(const std::string &device_name, uint32_t device_id);
+  KernelRuntime *GetCurrentKernelRuntime();
   KernelRuntime *GetSingleKernelRuntime(const std::string &device_name, uint32_t device_id);
   void ReleaseKernelRuntime(const std::string &device_name, uint32_t device_id);
   void ClearRuntimeResource();
diff --git a/mindspore/ccsrc/runtime/device/memory_manager.cc b/mindspore/ccsrc/runtime/device/memory_manager.cc
index 46d0ca8b30d..cea4b4c55cd 100644
--- a/mindspore/ccsrc/runtime/device/memory_manager.cc
+++ b/mindspore/ccsrc/runtime/device/memory_manager.cc
@@ -27,7 +27,7 @@ using mindspore::memreuse::MemReuseUtilPtr;
 
 namespace mindspore {
 namespace device {
-size_t MemoryManager::GetCommonAlignSize(size_t input_size) const {
+size_t MemoryManager::GetCommonAlignSize(size_t input_size) {
   return (input_size + kMemAlignSize + 31) / kMemAlignSize * kMemAlignSize;
 }
 
diff --git a/mindspore/ccsrc/runtime/device/memory_manager.h b/mindspore/ccsrc/runtime/device/memory_manager.h
index 7f0564c5818..5dd77378762 100644
--- a/mindspore/ccsrc/runtime/device/memory_manager.h
+++ b/mindspore/ccsrc/runtime/device/memory_manager.h
@@ -53,13 +53,14 @@ class MemoryManager {
 
   virtual bool MallocMemFromMemPool(const DeviceAddressPtr address, size_t size);
   virtual void *MallocMemFromMemPool(size_t size);
+  virtual uint8_t *MallocCommunicationMemFromMemPool(size_t size) { return nullptr; }
   virtual void FreeMemFromMemPool(const DeviceAddressPtr address);
   virtual void FreeMemFromMemPool(void *device_ptr);
   virtual bool MallocContinuousMemFromMemPool(const DeviceAddressPtrList addr_list, size_t total_size,
                                               std::vector<size_t> size_list);
   virtual std::vector<void *> MallocContinuousMemFromMemPool(size_t total_size, std::vector<size_t> size_list);
 
-  size_t GetCommonAlignSize(size_t input_size) const;
+  static size_t GetCommonAlignSize(size_t input_size);
   size_t GetCommunicationAlignSize(size_t input_size) const;
 
  protected:
diff --git a/mindspore/ccsrc/utils/utils.h b/mindspore/ccsrc/utils/utils.h
index 4033ab2a356..1a95eb375a3 100644
--- a/mindspore/ccsrc/utils/utils.h
+++ b/mindspore/ccsrc/utils/utils.h
@@ -273,6 +273,10 @@ constexpr auto kOneHotOpName = "OneHot";
 constexpr auto kSoftmaxCrossEntropyWithLogitsOpName = "SoftmaxCrossEntropyWithLogits";
 constexpr auto kUniformCandidateSamplerOpName = "UniformCandidateSampler";
 
+// Communication world group
+constexpr auto kNcclWorldGroup = "nccl_world_group";
+constexpr auto kHcclWorldGroup = "hccl_world_group";
+
 // Hcom Op Type
 constexpr auto kHcomOpTypeAllReduce = "HcomAllReduce";
 constexpr auto kHcomOpTypeAllGather = "HcomAllGather";
@@ -331,12 +335,15 @@ constexpr auto kAttrSrTag = "sr_tag";
 constexpr auto kAttrRootRank = "root_rank";
 constexpr auto kAttrIsTraining = "is_training";
 constexpr auto kAttrFusionId = "fusion_id";
+constexpr auto kAttrBucketId = "bucket_id";
+constexpr auto kAttrGradOutputIndex = "grad_output_index";
 constexpr auto kAttrLabelIndex = "label_index";
 constexpr auto kAttrLabelSwitchList = "label_switch_list";
 constexpr auto kAttrNewAxisMask = "new_axis_mask";
 constexpr auto kAttrShrinkAxisMask = "shrink_axis_mask";
 constexpr auto kAttrDatadumpOriginalNames = "_datadump_original_names";
 constexpr auto kAttrDatadumpIsMultiop = "_datadump_is_multiop";
+constexpr auto kAttrNeedRecordEvent = "need_record_event";
 constexpr auto kAttrStreamId = "stream_id";
 constexpr auto kAttrRecordEvent = "record_event";
 constexpr auto kAttrWaitEvent = "wait_event";
diff --git a/mindspore/core/ir/device_event.h b/mindspore/core/ir/device_event.h
new file mode 100644
index 00000000000..8309d2b4e37
--- /dev/null
+++ b/mindspore/core/ir/device_event.h
@@ -0,0 +1,31 @@
+/**
+ * Copyright 2021 Huawei Technologies Co., Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MINDSPORE_CORE_IR_DEVICE_EVENT_H
+#define MINDSPORE_CORE_IR_DEVICE_EVENT_H
+
+namespace mindspore {
+class DeviceEvent {
+ public:
+  virtual ~DeviceEvent() = default;
+  virtual void WaitEvent() = 0;
+  virtual void RecordEvent() = 0;
+  virtual bool NeedWait() = 0;
+  virtual void set_wait_stream(void *stream) = 0;
+  virtual void set_record_stream(void *stream) = 0;
+};
+}  // namespace mindspore
+#endif  // MINDSPORE_CORE_IR_DEVICE_EVENT_H
diff --git a/mindspore/core/ir/func_graph.cc b/mindspore/core/ir/func_graph.cc
index fe3634ef4b6..4d972f3f7b3 100644
--- a/mindspore/core/ir/func_graph.cc
+++ b/mindspore/core/ir/func_graph.cc
@@ -44,6 +44,7 @@ FuncGraph::FuncGraph()
       kwonlyargs_count_(0),
       hyper_param_count_(0),
       is_generated_(false),
+      is_bprop_(false),
       return_(nullptr),
       manager_(std::weak_ptr<FuncGraphManager>()),
       stub_(false),
diff --git a/mindspore/core/ir/func_graph.h b/mindspore/core/ir/func_graph.h
index 9d70155c157..b2253d5beb6 100644
--- a/mindspore/core/ir/func_graph.h
+++ b/mindspore/core/ir/func_graph.h
@@ -217,6 +217,8 @@ class FuncGraph : public FuncGraphBase, public EffectInfoHolder {
   FuncGraphPtr GenerateGraph(const AbstractBasePtrList &args_spec_list);
   void set_is_generate(bool generated) { is_generated_ = generated; }
   bool is_generated() const { return is_generated_; }
+  void set_is_bprop(bool is_brop) { is_bprop_ = is_brop; }
+  bool is_bprop() const { return is_bprop_; }
 
   std::unordered_map<std::string, ValuePtr> &attrs() { return attrs_; }
   void set_attrs(const std::unordered_map<std::string, ValuePtr> &attrs) {
@@ -440,6 +442,8 @@ class FuncGraph : public FuncGraphBase, public EffectInfoHolder {
   // the argument input list for the graph used to generate this graph
   bool is_generated_;
 
+  bool is_bprop_;
+
   // the cnode that calls 'return' primitive
   // we use shared pointer to manage it.
   CNodePtr return_;
diff --git a/mindspore/core/ir/tensor.cc b/mindspore/core/ir/tensor.cc
index cff8a43f195..5c9578496bc 100644
--- a/mindspore/core/ir/tensor.cc
+++ b/mindspore/core/ir/tensor.cc
@@ -247,6 +247,47 @@ class TensorDataImpl : public TensorData {
   }
 
  private:
+  void OutputFloatDataString(std::ostringstream &ss, bool isScalar, const T &value) const {
+    if (isScalar) {
+      ss << value;
+    } else {
+      // The placeholder of float16 is fixed at 11, while float/double is fixed at 15.
+      const int width = std::is_same<T, float16>::value ? 11 : 15;
+      // The printing precision of float16 is fixed at 4, while float/double is fixed at 8.
+      const int precision = std::is_same<T, float16>::value ? 4 : 8;
+      ss << std::setw(width) << std::setprecision(precision) << std::setiosflags(std::ios::scientific | std::ios::right)
+         << value;
+    }
+  }
+
+  void OutputBoolDataString(std::ostringstream &ss, bool isScalar, const T &value) const {
+    if (isScalar) {
+      ss << (value ? "True" : "False");
+    } else {
+      constexpr int bool_max_width = sizeof("False") - 1;
+      ss << std::setw(bool_max_width) << std::setiosflags(std::ios::right) << (value ? "True" : "False");
+    }
+  }
+
+  void OutputOtherDataString(std::ostringstream &ss, bool isScalar, const T &value, int *max_width) const {
+    if (isScalar) {
+      ss << value;
+    } else {
+      // Add a padding string before the number, such as "###123", for subsequent replacement.
+      const int width = GetNumLength(value);
+      *max_width = std::max(*max_width, width);
+      std::string pad(width, '#');
+      ss << pad;
+      if constexpr (std::is_same<T, uint8_t>::value) {
+        ss << static_cast<uint16_t>(value);
+      } else if constexpr (std::is_same<T, int8_t>::value) {
+        ss << static_cast<int16_t>(value);
+      } else {
+        ss << value;
+      }
+    }
+  }
+
   void OutputDataString(std::ostringstream &ss, ssize_t cursor, ssize_t start, ssize_t end, bool use_comma,
                         int *max_width) const {
     const bool isScalar = ndim_ == 0 && end - start == 1;
@@ -257,40 +298,11 @@ class TensorDataImpl : public TensorData {
     for (ssize_t i = start; i < end && (cursor + i) < static_cast<ssize_t>(data_size_); i++) {
       const auto value = data_[cursor + i];
       if constexpr (isFloat) {
-        if (isScalar) {
-          ss << value;
-        } else {
-          // The placeholder of float16 is fixed at 11, while float/double is fixed at 15.
-          const int width = std::is_same<T, float16>::value ? 11 : 15;
-          // The printing precision of float16 is fixed at 4, while float/double is fixed at 8.
-          const int precision = std::is_same<T, float16>::value ? 4 : 8;
-          ss << std::setw(width) << std::setprecision(precision)
-             << std::setiosflags(std::ios::scientific | std::ios::right) << value;
-        }
+        OutputFloatDataString(ss, isScalar, value);
       } else if (isBool) {
-        if (isScalar) {
-          ss << (value ? "True" : "False");
-        } else {
-          constexpr int bool_max_width = sizeof("False") - 1;
-          ss << std::setw(bool_max_width) << std::setiosflags(std::ios::right) << (value ? "True" : "False");
-        }
+        OutputBoolDataString(ss, isScalar, value);
       } else {
-        if (isScalar) {
-          ss << value;
-        } else {
-          // Add a padding string before the number, such as "###123", for subsequent replacement.
-          const int width = GetNumLength(value);
-          *max_width = std::max(*max_width, width);
-          std::string pad(width, '#');
-          ss << pad;
-          if constexpr (std::is_same<T, uint8_t>::value) {
-            ss << static_cast<uint16_t>(value);
-          } else if constexpr (std::is_same<T, int8_t>::value) {
-            ss << static_cast<int16_t>(value);
-          } else {
-            ss << value;
-          }
-        }
+        OutputOtherDataString(ss, isScalar, value, max_width);
       }
       if (!isScalar && i != end - 1) {
         if (use_comma) {
@@ -452,7 +464,8 @@ Tensor::Tensor(const Tensor &tensor)
       cache_enable_(tensor.cache_enable_),
       cache_tensor_ptr_(tensor.cache_tensor_ptr_),
       hashmap_tensor_ptr_(tensor.hashmap_tensor_ptr_),
-      padding_type_(tensor.padding_type()) {}
+      padding_type_(tensor.padding_type()),
+      device_event_(tensor.device_event_) {}
 
 Tensor::Tensor(const Tensor &tensor, TypeId data_type)
     : MetaTensor(data_type, tensor.shape_),
@@ -465,7 +478,8 @@ Tensor::Tensor(const Tensor &tensor, TypeId data_type)
       cache_enable_(tensor.cache_enable_),
       cache_tensor_ptr_(tensor.cache_tensor_ptr_),
       hashmap_tensor_ptr_(tensor.hashmap_tensor_ptr_),
-      padding_type_(tensor.padding_type()) {}
+      padding_type_(tensor.padding_type()),
+      device_event_(tensor.device_event_) {}
 
 Tensor::Tensor(TypeId data_type, const ShapeVector &shape, TensorDataPtr data)
     : MetaTensor(data_type, shape), data_(std::move(data)), id_(MakeId()) {}
@@ -527,6 +541,7 @@ Tensor &Tensor::AssignValue(const Tensor &tensor) {
     event_ = tensor.event_;
     sync_status_ = tensor.sync_status_;
     padding_type_ = tensor.padding_type_;
+    device_event_ = tensor.device_event_;
   }
   return *this;
 }
diff --git a/mindspore/core/ir/tensor.h b/mindspore/core/ir/tensor.h
index 063a7527b43..04b51e4f23b 100644
--- a/mindspore/core/ir/tensor.h
+++ b/mindspore/core/ir/tensor.h
@@ -30,6 +30,7 @@
 #include "base/float16.h"
 #include "utils/shape_utils.h"
 #include "utils/ms_exception.h"
+#include "ir/device_event.h"
 
 // brief mindspore namespace.
 //
@@ -326,6 +327,21 @@ class Tensor : public MetaTensor {
     event_ = nullptr;
   }
 
+  void SetDeviceEvent(const std::shared_ptr<DeviceEvent> &device_event) { device_event_ = device_event; }
+
+  void WaitDevice() {
+    if (device_event_ != nullptr) {
+      device_event_->WaitEvent();
+    }
+  }
+
+  bool NeedWaitDevice() const {
+    if (device_event_ != nullptr) {
+      return device_event_->NeedWait();
+    }
+    return false;
+  }
+
   void set_sync_status(TensorSyncStatus sync_status) { sync_status_ = sync_status; }
 
   TensorSyncStatus sync_status() const { return sync_status_; }
@@ -352,6 +368,7 @@ class Tensor : public MetaTensor {
   std::shared_ptr<Tensor> hashmap_tensor_ptr_{nullptr};
   std::vector<Axis> padding_type_;
   TypePtr cast_dtype_{nullptr};
+  std::shared_ptr<DeviceEvent> device_event_{nullptr};
 };
 using TensorPtr = std::shared_ptr<Tensor>;
 using TensorPtrList = std::vector<std::shared_ptr<Tensor>>;
diff --git a/mindspore/nn/wrap/grad_reducer.py b/mindspore/nn/wrap/grad_reducer.py
index 08e7604efa2..b68d9102a95 100644
--- a/mindspore/nn/wrap/grad_reducer.py
+++ b/mindspore/nn/wrap/grad_reducer.py
@@ -17,10 +17,11 @@ from mindspore import context
 from mindspore.nn.cell import Cell
 from mindspore.communication.management import GlobalComm, get_group_size
 from mindspore.common.tensor import RowTensor
-from mindspore.ops import functional as F, composite as C, operations as P
+from mindspore.ops import functional as F, composite as C
 from mindspore.ops.operations.comm_ops import AllReduce, AllGather
 from mindspore.parallel._auto_parallel_context import auto_parallel_context
 import mindspore.common.dtype as mstype
+from mindspore.common.tensor import Tensor
 
 reduce_opt = C.MultitypeFuncGraph("reduce_opt")
 
@@ -45,7 +46,7 @@ def _init_allreduce_operators(length, split_indices):
     return op_list
 
 
-@reduce_opt.register("Number", "Bool", "Function", "Function", "Bool", "Tensor")
+@reduce_opt.register("Tensor", "Bool", "Function", "Function", "Bool", "Tensor")
 def _tensors_allreduce(degree, mean, allgather, allreduce, allreduce_filter, grad):
     """
     Apply allreduce on gradient.
@@ -64,13 +65,33 @@ def _tensors_allreduce(degree, mean, allgather, allreduce, allreduce_filter, gra
     if allreduce_filter:
         grad = allreduce(grad)
         if mean:
-            degree = F.scalar_cast(degree, F.dtype(grad))
-            grad = F.tensor_mul(grad, F.cast(F.scalar_to_array(1.0 / degree), F.dtype(grad)))
+            grad = F.tensor_mul(grad, F.cast(degree, F.dtype(grad)))
         return grad
     return grad
 
+@reduce_opt.register("Tensor", "Bool", "Bool", "Tensor")
+def _tensors_allreduce_post(degree, mean, allreduce_filter, grad):
+    """
+    Apply allreduce on gradient in PyNative mode.
 
-@reduce_opt.register("Number", "Bool", "Function", "Function", "Bool", "Tensor", "Bool")
+    Args:
+        degree (int): The mean coefficient.
+        mean (bool): When mean is true, the mean coefficient (degree) would apply on gradients.
+        allgather (Primitive): The communication operator for sparse gradients.
+        allreduce (Primitive): The communication operator for gradients.
+        allreduce_filter (bool): When it is true, allreduce would apply.
+        grad (Tensor): The gradient tensor before operation.
+
+    Returns:
+        Tensor, the gradient tensor after operation.
+    """
+    if allreduce_filter:
+        if mean:
+            grad = F.tensor_mul(grad, F.cast(degree, F.dtype(grad)))
+        return grad
+    return grad
+
+@reduce_opt.register("Tensor", "Bool", "Function", "Function", "Bool", "Tensor", "Bool")
 def _tensors_allreduce_ps(degree, mean, allgather, allreduce, allreduce_filter, grad, ps_parameter):
     """
     Apply allreduce on gradient.
@@ -93,15 +114,12 @@ def _tensors_allreduce_ps(degree, mean, allgather, allreduce, allreduce_filter,
     if allreduce_filter:
         grad = allreduce(grad)
         if mean:
-            degree = F.scalar_cast(degree, F.dtype(grad))
-            cast_op = P.Cast()
-            mul_op = P.Mul()
-            grad = mul_op(grad, cast_op(F.scalar_to_array(1.0/degree), F.dtype(grad)))
+            grad = F.tensor_mul(grad, F.cast(degree, F.dtype(grad)))
         return grad
     return grad
 
 
-@reduce_opt.register("Number", "Bool", "Function", "Function", "Bool", "RowTensor")
+@reduce_opt.register("Tensor", "Bool", "Function", "Function", "Bool", "RowTensor")
 def _tensors_allreduce_with_sparse(degree, mean, allgather, allreduce, allreduce_filter, grad):
     """
     Apply allgather on gradient instead of allreduce for sparse feature.
@@ -122,15 +140,12 @@ def _tensors_allreduce_with_sparse(degree, mean, allgather, allreduce, allreduce
         indices = allgather(grad.indices)
         dout = allgather(grad.values)
         if mean:
-            degree = F.scalar_cast(degree, F.dtype(grad.values))
-            cast_op = P.Cast()
-            mul_op = P.Mul()
-            dout = mul_op(dout, cast_op(F.scalar_to_array(1.0 / degree), F.dtype(dout)))
+            dout = F.tensor_mul(dout, F.cast(degree, F.dtype(dout)))
         grad = RowTensor(indices, dout, grad.dense_shape)
     return grad
 
 
-@reduce_opt.register("Number", "Bool", "Function", "Function", "Bool", "RowTensor", "Bool")
+@reduce_opt.register("Tensor", "Bool", "Function", "Function", "Bool", "RowTensor", "Bool")
 def _tensors_allreduce_with_sparse_ps(degree, mean, allgather, allreduce, allreduce_filter, grad, ps_parameter):
     """
     Apply allgather on gradient instead of allreduce for sparse feature.
@@ -155,10 +170,7 @@ def _tensors_allreduce_with_sparse_ps(degree, mean, allgather, allreduce, allred
         indices = allgather(grad.indices)
         dout = allgather(grad.values)
         if mean:
-            degree = F.scalar_cast(degree, F.dtype(grad.values))
-            cast_op = P.Cast()
-            mul_op = P.Mul()
-            dout = mul_op(dout, cast_op(F.scalar_to_array(1.0 / degree), F.dtype(dout)))
+            dout = F.tensor_mul(dout, F.cast(degree, F.dtype(dout)))
         grad = RowTensor(indices, dout, grad.dense_shape)
     return grad
 
@@ -329,6 +341,7 @@ class DistributedGradReducer(Cell):
             if not isinstance(degree, int) or degree <= 0:
                 raise ValueError("Parameter 'degree' in DistributedGradReducer should large than 0 and be int")
             self.degree = degree
+        self.degree = Tensor(1.0 / self.degree, mstype.float32)
         self.mean = mean
         self.allreduce_filter = tuple(x.layerwise_parallel is False for x in parameters)
         is_parallel_optimizer = context.get_auto_parallel_context("enable_parallel_optimizer")
@@ -343,6 +356,7 @@ class DistributedGradReducer(Cell):
         ps_filter = lambda x: x.is_param_ps
         self.ps_parameters = tuple(ps_filter(x) for x in parameters)
         self.enable_parameter_server = any(self.ps_parameters)
+        self.mode = context.get_context("mode")
 
     def construct(self, grads):
         """
@@ -358,7 +372,9 @@ class DistributedGradReducer(Cell):
         """
         datatypes = self.map_(F.partial(_get_datatype), grads)
         grads = self.map_(F.partial(_cast_datatype, mstype.float32), grads)
-        if self.split_fusion:
+        if self.mode == context.PYNATIVE_MODE:
+            new_grad = self.map_(F.partial(reduce_opt, self.degree, self.mean), self.allreduce_filter, grads)
+        elif self.split_fusion:
             if self.enable_parameter_server:
                 new_grad = self.map_(F.partial(reduce_opt, self.degree, self.mean, self.allgather),
                                      self.op_list, self.allreduce_filter, grads, self.ps_parameters)
diff --git a/tests/ut/cpp/CMakeLists.txt b/tests/ut/cpp/CMakeLists.txt
index 0eb4a31cb11..c44cffde5f1 100644
--- a/tests/ut/cpp/CMakeLists.txt
+++ b/tests/ut/cpp/CMakeLists.txt
@@ -97,10 +97,13 @@ file(GLOB_RECURSE MINDSPORE_SRC_LIST RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}
         "../../../mindspore/ccsrc/runtime/device/memory_manager.cc"
         "../../../mindspore/ccsrc/runtime/device/kernel_runtime_manager.cc"
         "../../../mindspore/ccsrc/runtime/device/kernel_info.cc"
+        "../../../mindspore/ccsrc/runtime/device/bucket.cc"
         "../../../mindspore/ccsrc/runtime/device/ascend/profiling/*.cc"
         "../../../mindspore/ccsrc/runtime/device/ascend/kernel_select_ascend.cc"
         "../../../mindspore/ccsrc/runtime/device/ascend/kernel_select_graph_kernel.cc"
         "../../../mindspore/ccsrc/runtime/device/convert_tensor_utils.cc"
+        "../../../mindspore/ccsrc/runtime/device/ascend/ascend_bucket.cc"
+        "../../../mindspore/ccsrc/runtime/device/ascend/ascend_event.cc"
         "../../../mindspore/ccsrc/runtime/device/ascend/kernel_build_ascend.cc"
         "../../../mindspore/ccsrc/runtime/device/ascend/ascend_kernel_runtime.cc"
         "../../../mindspore/ccsrc/runtime/device/ascend/signal_util.cc"
diff --git a/tests/ut/cpp/stub/runtime/runtime_stub.cc b/tests/ut/cpp/stub/runtime/runtime_stub.cc
index 5f5a9d99c9c..8e468a809f8 100644
--- a/tests/ut/cpp/stub/runtime/runtime_stub.cc
+++ b/tests/ut/cpp/stub/runtime/runtime_stub.cc
@@ -160,3 +160,7 @@ RTS_API rtError_t rtSetMsprofReporterCallback(MsprofReporterCallback callback) {
 RTS_API rtError_t rtRegTaskFailCallbackByModule(const char *moduleName, rtTaskFailCallback callback) {
   return RT_ERROR_NONE;
 }
+
+RTS_API rtError_t rtMemsetAsync(void *ptr, uint64_t destMax, uint32_t value, uint64_t count, rtStream_t stream) {
+  return RT_ERROR_NONE;
+}