diff --git a/mindspore/lite/src/lite_kernel.cc b/mindspore/lite/src/lite_kernel.cc
index 6227f71ce47..1211299c784 100644
--- a/mindspore/lite/src/lite_kernel.cc
+++ b/mindspore/lite/src/lite_kernel.cc
@@ -45,7 +45,7 @@ void LiteKernel::FreeWorkspace() {
 bool LiteKernel::IsReady(const std::vector<lite::Tensor *> &scope_tensors) {
   return std::all_of(this->in_tensors().begin(), this->in_tensors().end(), [&](lite::Tensor *kernel_in_tensor) {
     if (IsContain(scope_tensors, kernel_in_tensor)) {
-      return (kernel_in_tensor->IsConst() || kernel_in_tensor->ref_count() >= 1);
+      return (kernel_in_tensor->IsConst() || kernel_in_tensor->IsGraphInput() || kernel_in_tensor->ref_count() >= 1);
     } else {
       return true;
     }
@@ -54,7 +54,7 @@ bool LiteKernel::IsReady(const std::vector<lite::Tensor *> &scope_tensors) {
 
 void LiteKernel::InitOutTensorInitRefCount() {
   for (auto *tensor : this->out_tensors_) {
-    int init_ref_count = 0;
+    size_t init_ref_count = 0;
     for (auto *post_kernel : this->out_kernels_) {
       init_ref_count +=
         std::count_if(post_kernel->in_tensors_.begin(), post_kernel->in_tensors_.end(),
@@ -81,7 +81,7 @@ int LiteKernel::DecOutTensorRefCount() {
 int LiteKernel::FreeInWorkTensor() const {
   for (auto &in_tensor : this->in_tensors_) {
     MS_ASSERT(in_tensor != nullptr);
-    if (in_tensor->IsConst()) {
+    if (in_tensor->IsConst() || in_tensor->IsGraphInput()) {
       continue;
     }
     MS_ASSERT(in_tensor->ref_count() > 0);
@@ -220,19 +220,18 @@ void LiteKernel::FindInoutKernels(const std::vector<kernel::LiteKernel *> &scope
   }
 }
 
-std::vector<kernel::LiteKernel *> LiteKernelUtil::SubgraphInputKernels(
-  const std::vector<kernel::LiteKernel *> &kernels) {
-  std::set<kernel::LiteKernel *> input_kernels;
+std::vector<kernel::LiteKernel *> LiteKernelUtil::SubgraphInputNodes(const std::vector<kernel::LiteKernel *> &kernels) {
+  std::set<kernel::LiteKernel *> input_nodes;
   for (const auto &kernel : kernels) {
     // if kernel has no pre-kernel, kernel is a graph input, it must be a subgraph input
     if (kernel->in_kernels().empty() && !kernel->in_tensors().empty()) {
-      input_kernels.insert(kernel);
+      input_nodes.insert(kernel);
       continue;
     }
     auto all_input_tensors = kernel->in_tensors();
     // remove all const tensor from input tensors
     for (auto iter = all_input_tensors.begin(); iter != all_input_tensors.end();) {
-      if ((*iter)->IsConst()) {
+      if ((*iter)->IsConst() || (*iter)->IsGraphInput()) {
         iter = all_input_tensors.erase(iter);
       } else {
         iter++;
@@ -249,83 +248,76 @@ std::vector<kernel::LiteKernel *> LiteKernelUtil::SubgraphInputKernels(
     }
     // if some input tensor is not from kernel in subgraph
     if (!all_input_tensors.empty()) {
-      input_kernels.insert(kernel);
+      input_nodes.insert(kernel);
     }
   }
   std::vector<kernel::LiteKernel *> result;
-  result.insert(result.end(), input_kernels.begin(), input_kernels.end());
+  result.insert(result.end(), input_nodes.begin(), input_nodes.end());
   return result;
 }
 
-std::vector<kernel::LiteKernel *> LiteKernelUtil::SubgraphOutputKernels(
+std::vector<kernel::LiteKernel *> LiteKernelUtil::SubgraphOutputNodes(
   const std::vector<kernel::LiteKernel *> &kernels) {
-  std::set<kernel::LiteKernel *> output_kernels;
+  std::set<kernel::LiteKernel *> output_nodes;
   // if kernel has no post-kernel, kernel is a graph output, it must be a subgraph output
   for (const auto &kernel : kernels) {
     if (kernel->is_model_output() || (kernel->out_kernels().empty() && !kernel->out_tensors().empty())) {
-      output_kernels.insert(kernel);
+      output_nodes.insert(kernel);
       continue;
     }
     for (const auto &output : kernel->out_kernels()) {
       auto out_kernel_in_graph = std::find(kernels.begin(), kernels.end(), output);
       if (out_kernel_in_graph == kernels.end()) {
-        output_kernels.insert(kernel);
+        output_nodes.insert(kernel);
         break;
       }
     }
   }
   std::vector<kernel::LiteKernel *> result;
-  result.insert(result.end(), output_kernels.begin(), output_kernels.end());
+  result.insert(result.end(), output_nodes.begin(), output_nodes.end());
   return result;
 }
 
 std::vector<lite::Tensor *> LiteKernelUtil::SubgraphInputTensors(const std::vector<kernel::LiteKernel *> &kernels) {
-  std::vector<lite::Tensor *> input_tensors;
-  std::vector<kernel::LiteKernel *> input_kernels = SubgraphInputKernels(kernels);
-  for (const auto &input_kernel : input_kernels) {
-    auto &outer_in_kernels = input_kernel->in_kernels();
-    auto &in_kernel_in_tensors = input_kernel->in_tensors();
-    if (outer_in_kernels.empty()) {
-      for (auto &in_kernel_in_tensor : in_kernel_in_tensors) {
-        if (!in_kernel_in_tensor->IsConst()) {
-          if (!IsContain(input_tensors, in_kernel_in_tensor)) {
-            input_tensors.push_back(in_kernel_in_tensor);
-          }
-        }
+  std::set<lite::Tensor *> input_tensors;
+  std::vector<kernel::LiteKernel *> input_nodes = SubgraphInputNodes(kernels);
+  for (const auto &input_node : input_nodes) {
+    auto &in_node_in_kernels = input_node->in_kernels();
+    auto &in_node_in_tensors = input_node->in_tensors();
+    for (auto &in_node_in_tensor : in_node_in_tensors) {
+      if (in_node_in_tensor->IsGraphInput()) {
+        input_tensors.insert(in_node_in_tensor);
       }
-      continue;
     }
-    for (auto outer_in_kernel : outer_in_kernels) {
-      auto iter = std::find(kernels.begin(), kernels.end(), outer_in_kernel);
+    for (auto in_node_in_kernel : in_node_in_kernels) {
+      auto iter = std::find(kernels.begin(), kernels.end(), in_node_in_kernel);
       if (iter != kernels.end()) {
         continue;
       }
-      auto &outer_in_kernel_out_tensors = outer_in_kernel->out_tensors();
-      for (auto in_kernel_in_tensor : in_kernel_in_tensors) {
+      auto &outer_in_kernel_out_tensors = in_node_in_kernel->out_tensors();
+      for (auto in_node_in_tensor : in_node_in_tensors) {
         auto outer_in_kernel_out_tensors_iter =
-          std::find(outer_in_kernel_out_tensors.begin(), outer_in_kernel_out_tensors.end(), in_kernel_in_tensor);
+          std::find(outer_in_kernel_out_tensors.begin(), outer_in_kernel_out_tensors.end(), in_node_in_tensor);
         if (outer_in_kernel_out_tensors_iter != outer_in_kernel_out_tensors.end()) {
-          if (!IsContain(input_tensors, in_kernel_in_tensor)) {
-            input_tensors.emplace_back(in_kernel_in_tensor);
-          }
+          input_tensors.insert(in_node_in_tensor);
         }
       }
     }
   }
-  return input_tensors;
+  std::vector<lite::Tensor *> result;
+  result.insert(result.end(), input_tensors.begin(), input_tensors.end());
+  return result;
 }
 
 std::vector<lite::Tensor *> LiteKernelUtil::SubgraphOutputTensors(const std::vector<kernel::LiteKernel *> &kernels) {
-  std::vector<lite::Tensor *> output_tensors;
-  std::vector<kernel::LiteKernel *> output_kernels = SubgraphOutputKernels(kernels);
-  for (const auto &output_kernel : output_kernels) {
+  std::set<lite::Tensor *> output_tensors;
+  std::vector<kernel::LiteKernel *> output_nodes = SubgraphOutputNodes(kernels);
+  for (const auto &output_kernel : output_nodes) {
     auto &outer_out_kernels = output_kernel->out_kernels();
     auto &out_kernel_out_tensors = output_kernel->out_tensors();
     if (outer_out_kernels.empty()) {
       for (auto out_kernel_out_tensor : out_kernel_out_tensors) {
-        if (!IsContain(output_tensors, out_kernel_out_tensor)) {
-          output_tensors.push_back(out_kernel_out_tensor);
-        }
+        output_tensors.insert(out_kernel_out_tensor);
       }
       continue;
     }
@@ -339,14 +331,14 @@ std::vector<lite::Tensor *> LiteKernelUtil::SubgraphOutputTensors(const std::vec
         auto outer_out_kernel_in_tensors_iter =
           std::find(outer_out_kernel_in_tensors.begin(), outer_out_kernel_in_tensors.end(), out_kernel_out_tensor);
         if (outer_out_kernel_in_tensors_iter != outer_out_kernel_in_tensors.end()) {
-          if (!IsContain(output_tensors, out_kernel_out_tensor)) {
-            output_tensors.emplace_back(out_kernel_out_tensor);
-          }
+          output_tensors.insert(out_kernel_out_tensor);
         }
       }
     }
   }
-  return output_tensors;
+  std::vector<lite::Tensor *> result;
+  result.insert(result.end(), output_tensors.begin(), output_tensors.end());
+  return result;
 }
 
 int LiteKernelUtil::TopologicalSortKernels(std::vector<kernel::LiteKernel *> *kernels) {
diff --git a/mindspore/lite/src/lite_kernel.h b/mindspore/lite/src/lite_kernel.h
index ad84737c90e..9e79e7ac4d5 100644
--- a/mindspore/lite/src/lite_kernel.h
+++ b/mindspore/lite/src/lite_kernel.h
@@ -56,7 +56,6 @@ enum SubGraphType { kNotSubGraph = 0, kCpuFP32SubGraph, kCpuFP16SubGraph, kGpuSu
 class LiteKernel {
  public:
   LiteKernel() = default;
-  // parameter should be deleted or freed by caller, and should be deleted or freed after LiteKernel is deleted
   LiteKernel(OpParameter *parameter, std::vector<lite::Tensor *> in_tensors, std::vector<lite::Tensor *> out_tensors,
              const lite::InnerContext *ctx, const mindspore::lite::PrimitiveC *primitive)
       : op_parameter_(parameter),
@@ -214,9 +213,9 @@ typedef LiteKernel *(*KernelCreator)(const std::vector<lite::Tensor *> &inputs,
 
 class LiteKernelUtil {
  public:
-  static std::vector<kernel::LiteKernel *> SubgraphInputKernels(const std::vector<kernel::LiteKernel *> &kernels);
+  static std::vector<kernel::LiteKernel *> SubgraphInputNodes(const std::vector<kernel::LiteKernel *> &kernels);
 
-  static std::vector<kernel::LiteKernel *> SubgraphOutputKernels(const std::vector<kernel::LiteKernel *> &kernels);
+  static std::vector<kernel::LiteKernel *> SubgraphOutputNodes(const std::vector<kernel::LiteKernel *> &kernels);
 
   static std::vector<lite::Tensor *> SubgraphInputTensors(const std::vector<kernel::LiteKernel *> &kernels);
 
diff --git a/mindspore/lite/src/lite_session.cc b/mindspore/lite/src/lite_session.cc
index e1019b5de07..96c16b7c92e 100644
--- a/mindspore/lite/src/lite_session.cc
+++ b/mindspore/lite/src/lite_session.cc
@@ -148,9 +148,6 @@ lite::Tensor *LiteSession::ConvertTensor(const schema::Tensor &src_tensor) {
   } else {
     dst_tensor = new (std::nothrow) Tensor(TypeId(src_tensor.dataType()), shape, src_tensor.format(), src_category);
   }
-  if (dst_tensor == nullptr) {
-    return nullptr;
-  }
   return dst_tensor;
 }
 
@@ -158,6 +155,8 @@ int LiteSession::ConvertTensors(const lite::Model *model) {
   MS_ASSERT(model != nullptr);
   copyed_tensor_idxes_.clear();
   uint32_t tensor_count = model->all_tensors_.size();
+  MS_ASSERT(!model->sub_graphs_.empty());
+  auto model_input_indices = model->sub_graphs_.front()->input_indices_;
   for (uint32_t i = 0; i < tensor_count; ++i) {
     auto *src_tensor = model->all_tensors_[i];
     if (src_tensor == nullptr) {
@@ -176,6 +175,9 @@ int LiteSession::ConvertTensors(const lite::Model *model) {
       return ret;
     }
     ConvertTensorsQuantParam(src_tensor, dst_tensor);
+    if (IsContain(model_input_indices, i)) {
+      dst_tensor->set_category(Tensor::GRAPH_INPUT);
+    }
     this->tensors_.emplace_back(dst_tensor);
   }
   return RET_OK;
@@ -329,6 +331,9 @@ void LiteSession::InitGraphInOutTensors(const lite::Model *model) {
   InitGraphOutputNodeMap(model);
   InitGraphOutputTensorNames(model);
   InitGraphOutputTensorMap(model);
+  for (auto *tensor : this->inputs_) {
+    tensor->set_category(Tensor::Category::GRAPH_INPUT);
+  }
 }
 
 int LiteSession::CompileGraph(Model *model) {
@@ -398,11 +403,6 @@ int LiteSession::PrepareKernels(Model *model) {
   // find in_kernels and out_kernels for subgraphs
   for (auto kernel : this->kernels_) {
     kernel->FindInoutKernels(this->kernels_);
-    auto ret = kernel->Prepare();
-    if (ret != RET_OK) {
-      MS_LOG(ERROR) << "Prepare kernel " << kernel->name() << " failed: " << ret;
-      return ret;
-    }
     auto sub_graph = reinterpret_cast<kernel::SubGraphKernel *>(kernel);
     MS_ASSERT(sub_graph != nullptr);
     auto kernel_in_subgraph = sub_graph->nodes();
@@ -417,6 +417,13 @@ int LiteSession::PrepareKernels(Model *model) {
     kernel->InitOutTensorInitRefCount();
   }
   AdjustModelOutputTensorInitRefCount(model);
+  for (auto kernel : this->kernels_) {
+    auto ret = kernel->Prepare();
+    if (ret != RET_OK) {
+      MS_LOG(ERROR) << "Prepare kernel " << kernel->name() << " failed: " << ret;
+      return ret;
+    }
+  }
   return RET_OK;
 }
 
diff --git a/mindspore/lite/src/runtime/kernel/arm/base/merge.cc b/mindspore/lite/src/runtime/kernel/arm/base/merge.cc
index ae3a25477d5..ad54decf621 100644
--- a/mindspore/lite/src/runtime/kernel/arm/base/merge.cc
+++ b/mindspore/lite/src/runtime/kernel/arm/base/merge.cc
@@ -28,7 +28,7 @@ namespace mindspore::kernel {
 int MergeCPUKernel::FreeInWorkTensor() const {
   for (auto &in_tensor : this->in_tensors_) {
     MS_ASSERT(in_tensor != nullptr);
-    if (in_tensor->IsConst()) {
+    if (in_tensor->IsConst() || in_tensor->IsGraphInput()) {
       continue;
     }
     if (in_tensor->ref_count() > 0) {
@@ -50,11 +50,13 @@ bool MergeCPUKernel::IsReady(const std::vector<lite::Tensor *> &scope_tensors) {
   MS_ASSERT(in_tensors().size() == 2 * out_tensors().size());
   return std::all_of(this->in_tensors().begin(), this->in_tensors().begin() + in_tensors().size() / 2,
                      [&](lite::Tensor *kernel_in_tensor) {
-                       return kernel_in_tensor->IsConst() || kernel_in_tensor->ref_count() >= 1;
+                       return kernel_in_tensor->IsConst() || kernel_in_tensor->IsGraphInput() ||
+                              kernel_in_tensor->ref_count() >= 1;
                      }) ||
          std::all_of(this->in_tensors().begin() + in_tensors().size() / 2, this->in_tensors().end(),
                      [&](lite::Tensor *kernel_in_tensor) {
-                       return kernel_in_tensor->IsConst() || kernel_in_tensor->ref_count() >= 1;
+                       return kernel_in_tensor->IsConst() || kernel_in_tensor->IsGraphInput() ||
+                              kernel_in_tensor->ref_count() >= 1;
                      });
 }
 
diff --git a/mindspore/lite/src/runtime/kernel/opencl/opencl_subgraph.cc b/mindspore/lite/src/runtime/kernel/opencl/opencl_subgraph.cc
index cad53923c51..cea8eb7fb5c 100644
--- a/mindspore/lite/src/runtime/kernel/opencl/opencl_subgraph.cc
+++ b/mindspore/lite/src/runtime/kernel/opencl/opencl_subgraph.cc
@@ -223,19 +223,7 @@ int OpenCLSubGraph::Init() {
   nodes_.insert(nodes_.end(), out_convert_ops_.begin(), out_convert_ops_.end());
   GetInOutNodes();
   UpdateTensorDataType();
-
-  ret = SubGraphKernel::Prepare();
-  if (ret != RET_OK) {
-    MS_LOG(ERROR) << "OpenCL prepare fail";
-    return ret;
-  }
-  auto opencl_exec = reinterpret_cast<lite::opencl::OpenCLExecutor *>(executor_);
-  // If tuning_mode is DEFAULT, just malloc memory for reuse.
-  ret = opencl_exec->RunOrTune(in_tensors_, out_tensors_, nodes_, allocator_, nullptr, nullptr, true);
-  if (ret != RET_OK) {
-    MS_LOG(ERROR) << "Run opencl executor failed: " << ret;
-    return ret;
-  }
+  Fusion();
   return RET_OK;
 }
 
@@ -307,10 +295,16 @@ int OpenCLSubGraph::Prepare() {
     MS_LOG(ERROR) << "Create OpenCLExecutor fail";
     return RET_ERROR;
   }
-  Fusion();
-  auto ret = Init();
+  auto ret = SubGraphKernel::Prepare();
   if (ret != RET_OK) {
-    MS_LOG(ERROR) << "OpenCL subgraph init fail";
+    MS_LOG(ERROR) << "OpenCL prepare fail";
+    return ret;
+  }
+  auto opencl_exec = reinterpret_cast<lite::opencl::OpenCLExecutor *>(executor_);
+  // If tuning_mode is DEFAULT, just malloc memory for reuse.
+  ret = opencl_exec->RunOrTune(in_tensors_, out_tensors_, nodes_, allocator_, nullptr, nullptr, true);
+  if (ret != RET_OK) {
+    MS_LOG(ERROR) << "Run opencl executor failed: " << ret;
     return ret;
   }
   return RET_OK;
diff --git a/mindspore/lite/src/runtime/opencl/opencl_executor.cc b/mindspore/lite/src/runtime/opencl/opencl_executor.cc
index 0c6f9c76f8c..046e76f0f78 100644
--- a/mindspore/lite/src/runtime/opencl/opencl_executor.cc
+++ b/mindspore/lite/src/runtime/opencl/opencl_executor.cc
@@ -79,6 +79,11 @@ int OpenCLExecutor::RunOrTune(std::vector<Tensor *> &inputs, std::vector<Tensor
         MS_LOG(ERROR) << "tuning kernel failed, name: " << kernel->name();
         return ret;
       }
+      ret = kernel->PostProcess();
+      if (ret != RET_OK) {
+        MS_LOG(ERROR) << "PostProcess kernel failed, name: " << kernel->name();
+        return ret;
+      }
     } else {
       ret = kernel->Run();
       if (ret != RET_OK) {
diff --git a/mindspore/lite/src/scheduler.cc b/mindspore/lite/src/scheduler.cc
index 3282708f1c5..d52fd701ade 100644
--- a/mindspore/lite/src/scheduler.cc
+++ b/mindspore/lite/src/scheduler.cc
@@ -375,6 +375,13 @@ int Scheduler::ConstructSubGraphs(std::vector<kernel::LiteKernel *> *kernels) {
     }
     kernels->emplace_back(subgraph);
   }
+  for (auto *subgraph : *kernels) {
+    auto ret = subgraph->Init();
+    if (ret != RET_OK) {
+      MS_LOG(ERROR) << "Init SubGraph failed: " << ret;
+      return ret;
+    }
+  }
   return RET_OK;
 }
 bool Scheduler::MergeOpIsReady(const kernel::LiteKernel *kernel,
@@ -407,12 +414,16 @@ kernel::SubGraphKernel *Scheduler::CreateSubGraphKernel(const std::vector<kernel
   }
   std::vector<Tensor *> input_tensors = kernel::LiteKernelUtil::SubgraphInputTensors(kernels);
   std::vector<Tensor *> output_tensors = kernel::LiteKernelUtil::SubgraphOutputTensors(kernels);
-  std::vector<kernel::LiteKernel *> input_kernels = kernel::LiteKernelUtil::SubgraphInputKernels(kernels);
-  std::vector<kernel::LiteKernel *> output_kernels = kernel::LiteKernelUtil::SubgraphOutputKernels(kernels);
+  std::vector<kernel::LiteKernel *> input_kernels = kernel::LiteKernelUtil::SubgraphInputNodes(kernels);
+  std::vector<kernel::LiteKernel *> output_kernels = kernel::LiteKernelUtil::SubgraphOutputNodes(kernels);
   if (type == kernel::kGpuSubGraph) {
 #if SUPPORT_GPU
     auto sub_kernel = new (std::nothrow)
       kernel::OpenCLSubGraph(input_tensors, output_tensors, input_kernels, output_kernels, kernels, context_);
+    if (sub_kernel == nullptr) {
+      MS_LOG(ERROR) << "Create OpenCLSubGraph failed";
+      return nullptr;
+    }
     return sub_kernel;
 #else
     return nullptr;
diff --git a/mindspore/lite/src/sub_graph_kernel.h b/mindspore/lite/src/sub_graph_kernel.h
index d829c104702..f91a95c173d 100644
--- a/mindspore/lite/src/sub_graph_kernel.h
+++ b/mindspore/lite/src/sub_graph_kernel.h
@@ -102,6 +102,8 @@ class SubGraphKernel : public LiteKernel {
 
   void InitOutTensorInitRefCount() override;
 
+  int Init() override { return mindspore::lite::RET_OK; }
+
   std::string ToString() const override;
 
   std::vector<LiteKernel *> nodes() { return this->nodes_; }
@@ -146,7 +148,7 @@ class CpuFp32SubGraph : public CpuSubGraph {
   }
 
   ~CpuFp32SubGraph() override = default;
-  int Init() override { return mindspore::lite::RET_ERROR; }
+  int Init() override { return CpuSubGraph::Init(); }
   int PreProcess() override { return CpuSubGraph::PreProcess(); }
   int Run() override { return CpuSubGraph::Run(); }
   int Run(const KernelCallBack &before, const KernelCallBack &after) override {
@@ -166,7 +168,7 @@ class CpuFp16SubGraph : public CpuSubGraph {
   }
 
   ~CpuFp16SubGraph() override = default;
-  int Init() override { return mindspore::lite::RET_ERROR; }
+  int Init() override { return CpuSubGraph::Init(); }
   int PreProcess() override;
   int Run() override { return CpuSubGraph::Run(); }
   int Run(const KernelCallBack &before, const KernelCallBack &after) override {
diff --git a/mindspore/lite/src/tensor.cc b/mindspore/lite/src/tensor.cc
index 23d798ed868..6b919093b6f 100644
--- a/mindspore/lite/src/tensor.cc
+++ b/mindspore/lite/src/tensor.cc
@@ -328,12 +328,6 @@ void *Tensor::MutableData() {
   return this->data_;
 }
 
-bool Tensor::IsConst() {
-  return (this->category_ == CONST_TENSOR || this->category_ == CONST_SCALAR) && this->data_ != nullptr;
-}
-
-bool Tensor::IsScalar() { return this->category_ == CONST_SCALAR && this->data_ != nullptr; }
-
 void Tensor::AddQuantParam(const QuantArg &quant_arg) { this->quant_params_.push_back(quant_arg); }
 
 std::vector<QuantArg> Tensor::quant_params() const { return this->quant_params_; }
diff --git a/mindspore/lite/src/tensor.h b/mindspore/lite/src/tensor.h
index 6a1c8a33895..c146d044037 100644
--- a/mindspore/lite/src/tensor.h
+++ b/mindspore/lite/src/tensor.h
@@ -45,7 +45,8 @@ class Tensor : public mindspore::tensor::MSTensor {
   enum Category {
     CONST_TENSOR,  // weight tensor
     CONST_SCALAR,  // weight scalar
-    VAR            // activation tensor
+    VAR,           // activation tensor
+    GRAPH_INPUT,
   };
   Tensor() = default;
 
@@ -102,11 +103,13 @@ class Tensor : public mindspore::tensor::MSTensor {
 
   virtual void set_data(void *data) { this->data_ = data; }
 
-  Category category() { return this->category_; }
+  Category category() const { return this->category_; }
+
+  void set_category(Category category) { this->category_ = category; }
 
   void set_format(schema::Format format) { this->format_ = format; }
 
-  schema::Format format() { return this->format_; }
+  schema::Format format() const { return this->format_; }
 
   size_t ref_count() const { return this->ref_count_; }
 
@@ -130,9 +133,13 @@ class Tensor : public mindspore::tensor::MSTensor {
 
   void set_quant_clusters(const std::vector<float> &clusters);
 
-  bool IsConst();
+  bool IsConst() const {
+    return (this->category_ == CONST_TENSOR || this->category_ == CONST_SCALAR) && this->data_ != nullptr;
+  }
 
-  bool IsScalar();
+  bool IsScalar() const { return this->category_ == CONST_SCALAR && this->data_ != nullptr; }
+
+  bool IsGraphInput() const { return this->category_ == GRAPH_INPUT; }
 
   void Prepare() {
     if (allocator_ != nullptr) {
diff --git a/mindspore/lite/test/ut/src/utils_test.cc b/mindspore/lite/test/ut/src/utils_test.cc
index d2a358f2a2e..6d7e8e352a5 100644
--- a/mindspore/lite/test/ut/src/utils_test.cc
+++ b/mindspore/lite/test/ut/src/utils_test.cc
@@ -56,9 +56,9 @@ TEST_F(UtilsTest, TestSubgraph) {
 
   std::vector<kernel::LiteKernel *> kernels = {kernel0.get(), kernel1.get(), kernel2.get()};
 
-  auto input_kernels = kernel::LiteKernelUtil::SubgraphInputKernels(kernels);
+  auto input_kernels = kernel::LiteKernelUtil::SubgraphInputNodes(kernels);
   ASSERT_EQ(input_kernels.size(), 1);
-  auto output_kernels = kernel::LiteKernelUtil::SubgraphOutputKernels(kernels);
+  auto output_kernels = kernel::LiteKernelUtil::SubgraphOutputNodes(kernels);
   ASSERT_EQ(output_kernels.size(), 1);
   auto input_tensors = kernel::LiteKernelUtil::SubgraphInputTensors(kernels);
   ASSERT_EQ(input_tensors.size(), 2);