diff --git a/include/api/model.h b/include/api/model.h
index cecda6499f7..8d34871527b 100644
--- a/include/api/model.h
+++ b/include/api/model.h
@@ -64,6 +64,14 @@ class MS_API Model {
   /// \return Status.
   Status Resize(const std::vector<MSTensor> &inputs, const std::vector<std::vector<int64_t>> &dims);
 
+  /// \brief Change the size and or content of weight tensors
+  ///
+  /// \param[in] new_weights a vector of tensors with new shapes and data to use in the model
+  ///            If data pointer is null, the data of the original tensors will be copied to the new ones
+  ///
+  /// \return Status.
+  Status UpdateWeights(const std::vector<MSTensor> &new_weights);
+
   /// \brief Inference model.
   ///
   /// \param[in] inputs A vector where model inputs are arranged in sequence.
diff --git a/mindspore/lite/include/lite_session.h b/mindspore/lite/include/lite_session.h
index a33dbf88f77..edb35444d72 100644
--- a/mindspore/lite/include/lite_session.h
+++ b/mindspore/lite/include/lite_session.h
@@ -14,8 +14,8 @@
  * limitations under the License.
  */
 
-#ifndef MINDSPORE_LITE_INCLUDE_LITE_SESSION_H
-#define MINDSPORE_LITE_INCLUDE_LITE_SESSION_H
+#ifndef MINDSPORE_LITE_INCLUDE_LITE_SESSION_H_
+#define MINDSPORE_LITE_INCLUDE_LITE_SESSION_H_
 
 #ifndef NOT_USE_STL
 #include <unordered_map>
@@ -190,6 +190,14 @@ class MS_API LiteSession {
     return mindspore::lite::RET_ERROR;
   }
 
+  /// \brief Change the size and or content of weight tensors
+  ///
+  /// \param[in] new_weights a vector of tensors with new shapes and data to use in the model
+  ///            If data pointer is null, the data of the original tensors will be copied to the new ones
+  ///
+  /// \return STATUS as an error code of operation, STATUS is defined in errorcode.h.
+  virtual int UpdateWeights(std::vector<tensor::MSTensor *> new_weights) { return mindspore::lite::RET_ERROR; }
+
   /// \brief Get model featuremap MindSpore Lite MSTensors of Training model prediction
   ///
   /// \return a vector of output tensors (MindSpore Lite MSTensor).
@@ -233,4 +241,4 @@ class MS_API LiteSession {
 };
 }  // namespace session
 }  // namespace mindspore
-#endif  // MINDSPORE_LITE_INCLUDE_LITE_SESSION_H
+#endif  // MINDSPORE_LITE_INCLUDE_LITE_SESSION_H_
diff --git a/mindspore/lite/src/cxx_api/model/model.cc b/mindspore/lite/src/cxx_api/model/model.cc
index a326bad8cbc..1cd1f2c3972 100644
--- a/mindspore/lite/src/cxx_api/model/model.cc
+++ b/mindspore/lite/src/cxx_api/model/model.cc
@@ -102,6 +102,14 @@ Status Model::Resize(const std::vector<MSTensor> &inputs, const std::vector<std:
   return impl_->Resize(inputs, dims);
 }
 
+Status Model::UpdateWeights(const std::vector<MSTensor> &new_weights) {
+  if (impl_ == nullptr) {
+    MS_LOG(ERROR) << "Model implement is null.";
+    return kLiteNullptr;
+  }
+  return impl_->UpdateWeights(new_weights);
+}
+
 Status Model::Predict(const std::vector<MSTensor> &inputs, std::vector<MSTensor> *outputs,
                       const MSKernelCallBack &before, const MSKernelCallBack &after) {
   if (impl_ == nullptr) {
diff --git a/mindspore/lite/src/cxx_api/model/model_impl.cc b/mindspore/lite/src/cxx_api/model/model_impl.cc
index 1359d4a3544..5e86996ce8a 100644
--- a/mindspore/lite/src/cxx_api/model/model_impl.cc
+++ b/mindspore/lite/src/cxx_api/model/model_impl.cc
@@ -559,6 +559,29 @@ Status ModelImpl::Resize(const std::vector<MSTensor> &inputs, const std::vector<
   return static_cast<StatusCode>(ret);
 }
 
+Status ModelImpl::UpdateWeights(const std::vector<MSTensor> &new_weights) {
+  if (session_ == nullptr) {
+    MS_LOG(ERROR) << "Session is null.";
+    return kLiteNullptr;
+  }
+  if (new_weights.empty()) {
+    MS_LOG(ERROR) << "New weights are empty.";
+    return kLiteInputParamInvalid;
+  }
+  std::vector<tensor::MSTensor *> inner_weights;
+  inner_weights.resize(new_weights.size());
+  for (size_t i = 0; i < new_weights.size(); i++) {
+    auto weight = new_weights[i];
+    if (weight.impl_ == nullptr || weight.impl_->lite_tensor() == nullptr) {
+      MS_LOG(ERROR) << "Input tensor " << weight.Name() << " is null.";
+      return kLiteInputTensorError;
+    }
+    inner_weights[i] = weight.impl_->lite_tensor();
+  }
+  auto ret = session_->UpdateWeights(inner_weights);
+  return static_cast<StatusCode>(ret);
+}
+
 session::LiteSession *ModelImpl::CreateLiteSession(lite::InnerContext *context) {
   auto session = new (std::nothrow) lite::LiteSession();
   if (session == nullptr) {
diff --git a/mindspore/lite/src/cxx_api/model/model_impl.h b/mindspore/lite/src/cxx_api/model/model_impl.h
index 99935d60ea6..90a6533cb90 100644
--- a/mindspore/lite/src/cxx_api/model/model_impl.h
+++ b/mindspore/lite/src/cxx_api/model/model_impl.h
@@ -63,6 +63,7 @@ class ModelImpl {
                const std::shared_ptr<Context> &model_context);
   Status Build(const std::string &model_path, ModelType model_type, const std::shared_ptr<Context> &model_context);
   Status Resize(const std::vector<MSTensor> &inputs, const std::vector<std::vector<int64_t>> &dims);
+  Status UpdateWeights(const std::vector<MSTensor> &new_weights);
 
   Status Predict(const std::vector<MSTensor> &inputs, std::vector<MSTensor> *outputs, const MSKernelCallBack &before,
                  const MSKernelCallBack &after);
diff --git a/mindspore/lite/src/cxx_api/types.cc b/mindspore/lite/src/cxx_api/types.cc
index 60830ead88f..4ea737940ca 100644
--- a/mindspore/lite/src/cxx_api/types.cc
+++ b/mindspore/lite/src/cxx_api/types.cc
@@ -91,7 +91,7 @@ MSTensor *MSTensor::CreateTensor(const std::vector<char> &name, enum DataType ty
     return nullptr;
   }
   if (data_len > 0 && data == nullptr) {
-    MS_LOG(ERROR) << "Mull data ptr of tensor.";
+    MS_LOG(ERROR) << "Null data ptr of tensor.";
     return nullptr;
   }
   auto impl = Impl::CreateTensorImpl(CharToString(name), type, shape, nullptr, data_len);
diff --git a/mindspore/lite/src/runtime/kernel/arm/fp32_grad/sparse_softmax_cross_entropy_with_logits.cc b/mindspore/lite/src/runtime/kernel/arm/fp32_grad/sparse_softmax_cross_entropy_with_logits.cc
index 085c381ee8e..eb03a177c0c 100644
--- a/mindspore/lite/src/runtime/kernel/arm/fp32_grad/sparse_softmax_cross_entropy_with_logits.cc
+++ b/mindspore/lite/src/runtime/kernel/arm/fp32_grad/sparse_softmax_cross_entropy_with_logits.cc
@@ -28,7 +28,7 @@ using mindspore::lite::RET_OK;
 using mindspore::schema::PrimitiveType_SparseSoftmaxCrossEntropyWithLogits;
 
 namespace mindspore::kernel {
-int SparseSoftmaxCrossEntropyWithLogitsCPUKernel::ReSize() { return RET_OK; }
+int SparseSoftmaxCrossEntropyWithLogitsCPUKernel::ReSize() { return Prepare(); }
 
 int SparseSoftmaxCrossEntropyWithLogitsCPUKernel::ForwardPostExecute(const int *labels, const float *losses,
                                                                      float *output) const {
diff --git a/mindspore/lite/src/runtime/kernel/arm/fp32_grad/strided_slice_grad.cc b/mindspore/lite/src/runtime/kernel/arm/fp32_grad/strided_slice_grad.cc
index 5141274fbcb..a603664e513 100644
--- a/mindspore/lite/src/runtime/kernel/arm/fp32_grad/strided_slice_grad.cc
+++ b/mindspore/lite/src/runtime/kernel/arm/fp32_grad/strided_slice_grad.cc
@@ -50,8 +50,6 @@ int StridedSliceGradCPUKernel::Prepare() {
       MS_LOG(ERROR) << "Not supported data type: " << input->data_type();
       return RET_ERROR;
   }
-  FillEmptyDims();
-  FillOutputDim();
   return ReSize();
 }
 
@@ -113,7 +111,11 @@ void StridedSliceGradCPUKernel::FillOutputDim() {
   }
 }
 
-int StridedSliceGradCPUKernel::ReSize() { return RET_OK; }
+int StridedSliceGradCPUKernel::ReSize() {
+  FillEmptyDims();
+  FillOutputDim();
+  return RET_OK;
+}
 
 int StridedSliceGradImpl(void *cdata, int task_id, float lhs_scale, float rhs_scale) {
   CHECK_NULL_RETURN(cdata);
diff --git a/mindspore/lite/src/train/train_session.cc b/mindspore/lite/src/train/train_session.cc
index 0a5bb42991c..ea524b4ff2d 100644
--- a/mindspore/lite/src/train/train_session.cc
+++ b/mindspore/lite/src/train/train_session.cc
@@ -176,6 +176,89 @@ int TrainSession::InitCallBack() {
   return RET_OK;
 }
 
+static int ReshapeWeightTensor(Tensor *orig_tensor, tensor::MSTensor *new_tensor) {
+  if (orig_tensor->data_type() != new_tensor->data_type()) {
+    MS_LOG(ERROR) << "Cannot reshape tensor of different type: " << new_tensor->tensor_name();
+    return RET_PARAM_INVALID;
+  }
+
+  if (orig_tensor->category() != lite::Category::CONST_TENSOR) {
+    MS_LOG(ERROR) << "Cannot reshape non const tensor: " << new_tensor->tensor_name();
+    return RET_ERROR;
+  }
+
+  auto orig_size = orig_tensor->Size();
+  uint8_t *new_data = reinterpret_cast<uint8_t *>(new_tensor->data());
+  if (new_data == nullptr) {
+    // Copy original data into new_tensor
+    new_data = reinterpret_cast<uint8_t *>(new_tensor->MutableData());
+    if (new_data == nullptr) {
+      MS_LOG(ERROR) << "Allocation of Data Failed" << new_tensor->tensor_name();
+      return RET_ERROR;
+    }
+    if (orig_size == 0) {
+      MS_LOG(ERROR) << "Operation failed: Both new tensors and original one have no data";
+      return RET_ERROR;
+    }
+    uint8_t *orig_data = reinterpret_cast<uint8_t *>(orig_tensor->data());
+    for (unsigned int loc = 0; loc < new_tensor->Size(); loc++) {
+      new_data[loc] = orig_data[loc % orig_size];
+    }
+  }
+
+  orig_tensor->FreeData();
+  orig_tensor->set_data(nullptr);
+  orig_tensor->set_shape(new_tensor->shape());
+
+  uint8_t *dst_data = reinterpret_cast<uint8_t *>(orig_tensor->MutableData());
+  if (dst_data == nullptr) {
+    MS_LOG(ERROR) << "Allocation of Data Failed";
+    return RET_ERROR;
+  }
+  std::copy(new_data, new_data + orig_tensor->Size(), dst_data);
+  return RET_OK;
+}
+
+int TrainSession::UpdateWeights(std::vector<tensor::MSTensor *> modify_tensors) {
+  unsigned int num_of_found_tensors = 0;
+  for (auto tensor : tensors_) {
+    for (auto modify : modify_tensors) {
+      if (modify == nullptr) {
+        MS_LOG(ERROR) << "Tensor is nullptr";
+        return RET_PARAM_INVALID;
+      }
+      if (modify->tensor_name() == tensor->tensor_name()) {
+        auto ret = ReshapeWeightTensor(tensor, modify);
+        num_of_found_tensors++;
+        if (ret != RET_OK) {
+          return ret;
+        }
+        break;
+      }
+    }
+  }
+  if (num_of_found_tensors != modify_tensors.size()) {
+    MS_LOG(ERROR) << "Did not find all the given tensors in the model";
+    return RET_ERROR;
+  }
+  auto ret = ReSizeKernels(kernels_);
+  if (ret != RET_OK) {
+    MS_LOG(ERROR) << "Resize kernels fail!";
+    return ret;
+  }
+
+  bool is_eval = IsEval();
+  ret = Train();  // This will trigger proper Allocation of static data;
+  if (ret != RET_OK) {
+    MS_LOG(ERROR) << "General failure occurred during Update of Weights";
+    return ret;
+  }
+  if (is_eval) {
+    ret = Eval();
+  }
+  return ret;
+}
+
 int TrainSession::AllocTensors(const std::vector<kernel::LiteKernel *> &kernels) {
   if (!IS_STATIC_ALLOCATOR(allocator_)) return RET_OK;
   OptAllocator allocator;
@@ -199,8 +282,12 @@ int TrainSession::AllocTensors(const std::vector<kernel::LiteKernel *> &kernels)
     }
   }
   // Set Tensor data
+  auto size = allocator.total_size();
+  if (size > tensors_data_size_) {
+    free(tensors_data_);
+    tensors_data_ = nullptr;
+  }
   if (tensors_data_ == nullptr) {
-    auto size = allocator.total_size();
     auto buf = malloc(size);
     if (buf == nullptr) {
       MS_LOG(ERROR) << "cannot allocate buffer size" << size;
@@ -209,6 +296,7 @@ int TrainSession::AllocTensors(const std::vector<kernel::LiteKernel *> &kernels)
     StaticAllocator *alloc = reinterpret_cast<StaticAllocator *>(allocator_.get());
     alloc->SetContex(buf, size);
     tensors_data_ = buf;
+    tensors_data_size_ = size;
   }
   for (auto kernel : train_kernels_) {
     for (auto tensor : kernel->out_tensors()) {
diff --git a/mindspore/lite/src/train/train_session.h b/mindspore/lite/src/train/train_session.h
index 7ac679de060..d125146bf64 100644
--- a/mindspore/lite/src/train/train_session.h
+++ b/mindspore/lite/src/train/train_session.h
@@ -85,6 +85,7 @@ class TrainSession : virtual public lite::LiteSession {
     return lite::LiteSession::GetOutputByTensorName(tensor_name);
   }
   int Resize(const std::vector<tensor::MSTensor *> &inputs, const std::vector<std::vector<int>> &dims) override;
+  int UpdateWeights(std::vector<tensor::MSTensor *> new_weights) override;
 
   std::vector<tensor::MSTensor *> GetPredictions() const override {
     std::vector<tensor::MSTensor *> outputs;
@@ -166,6 +167,7 @@ class TrainSession : virtual public lite::LiteSession {
   SchedCallBack sched_mix_precision_callback_;
   bool train_mode_ = false;
   void *tensors_data_ = nullptr;
+  unsigned int tensors_data_size_ = 0;
   std::shared_ptr<Allocator> allocator_;
 };
 
diff --git a/mindspore/lite/test/ut/src/runtime/kernel/arm/cxx_api/model_test.cc b/mindspore/lite/test/ut/src/runtime/kernel/arm/cxx_api/model_test.cc
index e10d02f3123..2ea6bec5a1e 100644
--- a/mindspore/lite/test/ut/src/runtime/kernel/arm/cxx_api/model_test.cc
+++ b/mindspore/lite/test/ut/src/runtime/kernel/arm/cxx_api/model_test.cc
@@ -229,4 +229,29 @@ TEST_F(TestCxxApiLiteModel, test_fp16_SUCCESS) {
   train_cfg->mix_precision_cfg_.is_raw_mix_precision_ = true;
   ASSERT_TRUE(model.Build(GraphCell(graph), context, train_cfg) == kSuccess);
 }
+
+#define NUM_OF_CLASSES 10
+#define FEATURE_SIZE 10
+TEST_F(TestCxxApiLiteModel, set_weights_FAILURE) {
+  Model model;
+  Graph graph;
+  auto context = std::make_shared<Context>();
+  auto cpu_context = std::make_shared<mindspore::CPUDeviceInfo>();
+  cpu_context->SetEnableFP16(true);
+  context->MutableDeviceInfo().push_back(cpu_context);
+  auto train_cfg = std::make_shared<TrainCfg>();
+  train_cfg->mix_precision_cfg_.is_raw_mix_precision_ = true;
+
+  ASSERT_TRUE(Serialization::Load("./nets/mix_lenet_tod.ms", ModelType::kMindIR, &graph) == kSuccess);
+  ASSERT_TRUE(model.Build(GraphCell(graph), context, train_cfg) == kSuccess);
+  std::vector<mindspore::MSTensor> changes;
+  ASSERT_TRUE(model.UpdateWeights(changes) != kSuccess);
+  changes.push_back(
+    *MSTensor::CreateTensor("fc4.weight", mindspore::DataType::kNumberTypeFloat32, {NUM_OF_CLASSES}, nullptr, 0));
+  ASSERT_TRUE(model.UpdateWeights(changes) != kSuccess);
+  changes.clear();
+  changes.push_back(
+    *MSTensor::CreateTensor("fc3.bias", mindspore::DataType::kNumberTypeFloat32, {NUM_OF_CLASSES}, nullptr, 0));
+  ASSERT_TRUE(model.UpdateWeights(changes) == kSuccess);
+}
 }  // namespace mindspore