diff --git a/mindspore/ccsrc/frontend/parallel/device_manager.h b/mindspore/ccsrc/frontend/parallel/device_manager.h
index 1fdcb2f5aa..21d776a067 100644
--- a/mindspore/ccsrc/frontend/parallel/device_manager.h
+++ b/mindspore/ccsrc/frontend/parallel/device_manager.h
@@ -75,6 +75,7 @@ class DeviceManager {
 
   size_t DeviceNum() const { return devices_.size(); }
   int64_t stage_num() const { return stage_num_; }
+  int64_t stage_device_num() const { return stage_device_num_; }
   int64_t stage_id() const { return stage_id_; }
   int64_t rank_index_in_stage() const { return rank_index_in_stage_; }
   int64_t global_rank() const { return global_rank_; }
diff --git a/mindspore/ccsrc/frontend/parallel/ops_info/activation_info.cc b/mindspore/ccsrc/frontend/parallel/ops_info/activation_info.cc
index 9eb4a4ea90..b457c6d3d7 100644
--- a/mindspore/ccsrc/frontend/parallel/ops_info/activation_info.cc
+++ b/mindspore/ccsrc/frontend/parallel/ops_info/activation_info.cc
@@ -41,11 +41,9 @@ Status DropoutInfo::CheckStrategy(const StrategyPtr &strategy) {
   }
 
   // dropout don't support repeated calculation
-  CheckGlobalDeviceManager();
   auto input_strategy = strategy->GetInputDim().at(0);
-  size_t dev_num = g_device_manager->GetDeviceListByStageId(stage_id_).size();
   auto product_p = std::accumulate(input_strategy.begin(), input_strategy.end(), 1, std::multiplies<int64_t>());
-  if (IntToSize(product_p) != dev_num) {
+  if (product_p != stage_device_size_) {
     MS_LOG(ERROR) << name_ << ": Invalid strategy. Don't support repeated calc.";
     return FAILED;
   }
diff --git a/mindspore/ccsrc/frontend/parallel/ops_info/batch_parallel_info.cc b/mindspore/ccsrc/frontend/parallel/ops_info/batch_parallel_info.cc
index d0d88f65df..de4617c83c 100644
--- a/mindspore/ccsrc/frontend/parallel/ops_info/batch_parallel_info.cc
+++ b/mindspore/ccsrc/frontend/parallel/ops_info/batch_parallel_info.cc
@@ -32,11 +32,6 @@ Status BatchParallelInfo::CheckStrategy(const StrategyPtr &strategy) {
     return FAILED;
   }
 
-  int64_t stage = strategy->GetInputStage();
-  CheckGlobalDeviceManager();
-  int64_t dev_num = SizeToLong(g_device_manager->GetDeviceListByStageId(stage).size());
-  dev_num_ = dev_num;
-
   size_t strategy_size = strategy->GetInputNumber();
   Strategys stra = strategy->GetInputDim();
   for (size_t i = 0; i < strategy_size; ++i) {
@@ -46,7 +41,7 @@ Status BatchParallelInfo::CheckStrategy(const StrategyPtr &strategy) {
     for (size_t j = 0; j < strategy_len; ++j) {
       int64_t strategy_value = sub_strategy.at(j);
       if (strategy_value > 1) {
-        if (flag || strategy_value != dev_num_) {
+        if (flag || strategy_value != stage_device_size_) {
           MS_LOG(ERROR) << name_ << " : It is not a valid data parallel strategy.";
           return FAILED;
         }
@@ -58,7 +53,7 @@ Status BatchParallelInfo::CheckStrategy(const StrategyPtr &strategy) {
 }
 
 Status BatchParallelInfo::InferDevMatrixShape() {
-  dev_matrix_shape_.push_back(dev_num_);
+  dev_matrix_shape_.push_back(stage_device_size_);
   return SUCCESS;
 }
 
@@ -81,14 +76,14 @@ Status BatchParallelInfo::InferMirrorOps() {
 Status BatchParallelInfo::InferForwardCommunication() { return SUCCESS; }
 
 Status BatchParallelInfo::InferTensorMap() {
-  if (strategy_->GetInputDim()[0][0] != dev_num_) {
+  if (strategy_->GetInputDim()[0][0] != stage_device_size_) {
     MS_LOG(ERROR) << name_ << " : It is not a valid data parallel strategy.";
     return FAILED;
   }
   for (size_t i = 0; i < inputs_shape_.size(); i++) {
     Shape tensor_map_index;
     for (size_t j = 0; j < inputs_shape_[i].size(); ++j) {
-      if (strategy_->GetInputDim()[i][j] == dev_num_ && j == 0) {
+      if (strategy_->GetInputDim()[i][j] == stage_device_size_ && j == 0) {
         tensor_map_index.push_back(0);
       } else {
         tensor_map_index.push_back(MAP_NONE);
@@ -117,7 +112,7 @@ Strategys BatchParallelInfo::GetOutputsStrategy() {
     Dimensions strategy;
     for (size_t j = 0; j < outputs_shape_[i].size(); ++j) {
       if (i == 0 && j == 0) {
-        strategy.push_back(dev_num_);
+        strategy.push_back(stage_device_size_);
       } else {
         strategy.push_back(1);
       }
@@ -176,14 +171,12 @@ Status BatchParallelInfo::SetCostUnderStrategy(const StrategyPtr &strategy) {
 }
 
 Status BatchParallelInfo::GenerateStrategies(int64_t stage_id) {
-  CheckGlobalDeviceManager();
-  size_t total_dev_num = g_device_manager->GetDeviceListByStageId(stage_id).size();
   StrategyPtr sp;
   Strategys strategy;
   for (size_t i = 0; i < inputs_shape_.size(); i++) {
     Shape temp(inputs_shape_[i].size(), 1);
     if (split_flag_list_[i]) {
-      temp[0] = SizeToLong(total_dev_num);
+      temp[0] = stage_device_size_;
     }
     strategy.push_back(temp);
   }
diff --git a/mindspore/ccsrc/frontend/parallel/ops_info/dropout_do_mask_info.cc b/mindspore/ccsrc/frontend/parallel/ops_info/dropout_do_mask_info.cc
index 04a9f241a8..6d0d84178a 100644
--- a/mindspore/ccsrc/frontend/parallel/ops_info/dropout_do_mask_info.cc
+++ b/mindspore/ccsrc/frontend/parallel/ops_info/dropout_do_mask_info.cc
@@ -151,10 +151,8 @@ Status DropoutDoMaskInfo::GenerateStrategies(int64_t stage_id) {
 }
 
 std::shared_ptr<Strategys> DropoutDoMaskInfo::GenerateBatchStrategies() {
-  CheckGlobalDeviceManager();
-  size_t dev_num = g_device_manager->GetDeviceListByStageId(0).size();
   Dimensions strategy(inputs_shape_[0].size() - 1, 1);
-  (void)strategy.insert(strategy.begin(), SizeToLong(dev_num));
+  (void)strategy.insert(strategy.begin(), stage_device_size_);
   Strategys strategy_v = {strategy};
   return std::make_shared<Strategys>(strategy_v);
 }
diff --git a/mindspore/ccsrc/frontend/parallel/ops_info/gather_v2_info.cc b/mindspore/ccsrc/frontend/parallel/ops_info/gather_v2_info.cc
index 6568c54c24..4adf6c1973 100644
--- a/mindspore/ccsrc/frontend/parallel/ops_info/gather_v2_info.cc
+++ b/mindspore/ccsrc/frontend/parallel/ops_info/gather_v2_info.cc
@@ -308,8 +308,6 @@ std::shared_ptr<Strategys> GatherV2Info::GenerateBatchStrategies() {
     MS_LOG(EXCEPTION) << name_ << ": inputs shape size must be " << GATHER_V2_INPUTS_SIZE << ", but is "
                       << inputs_shape_.size();
   }
-  CheckGlobalDeviceManager();
-  size_t dev_num = g_device_manager->GetDeviceListByStageId(0).size();
   if (GetAttrs() != SUCCESS) {
     MS_LOG(EXCEPTION) << "GetAttrs failed!";
   }
@@ -318,7 +316,7 @@ std::shared_ptr<Strategys> GatherV2Info::GenerateBatchStrategies() {
   if (index_size_ != 1) {
     strategy.push_back(1);
   } else {
-    strategy.push_back(SizeToLong(dev_num));
+    strategy.push_back(stage_device_size_);
   }
   for (size_t i = 1; i < inputs_shape_[0].size(); i++) {
     strategy.push_back(1);
diff --git a/mindspore/ccsrc/frontend/parallel/ops_info/gather_v2_p_info.cc b/mindspore/ccsrc/frontend/parallel/ops_info/gather_v2_p_info.cc
index 3102327572..444134b177 100644
--- a/mindspore/ccsrc/frontend/parallel/ops_info/gather_v2_p_info.cc
+++ b/mindspore/ccsrc/frontend/parallel/ops_info/gather_v2_p_info.cc
@@ -199,10 +199,8 @@ Status GatherV2PInfo::CheckManualSplit(const Strategys &strategy) {
   }
 
   // Don't support repeated calc
-  CheckGlobalDeviceManager();
-  size_t dev_num = g_device_manager->GetDeviceListByStageId(stage_id_).size();
   auto product_p = std::accumulate(param_strategy.begin(), param_strategy.end(), 1, std::multiplies<int64_t>());
-  if (IntToSize(product_p) < dev_num) {
+  if (product_p < stage_device_size_) {
     MS_LOG(ERROR) << name_ << ": Manual split doesn't support repeated calc";
     return FAILED;
   }
@@ -272,10 +270,8 @@ Status GatherV2PInfo::CheckStrategy(const StrategyPtr &strategy) {
   }
 
   // param_strategy(axis) != 1, Don't support repeated calc
-  CheckGlobalDeviceManager();
-  size_t dev_num = g_device_manager->GetDeviceListByStageId(stage_id_).size();
   auto product_p = std::accumulate(param_strategy.begin(), param_strategy.end(), 1, std::multiplies<int64_t>());
-  if (IntToSize(product_p) != dev_num && param_strategy.at(IntToSize(axis_)) != 1) {
+  if (product_p != stage_device_size_ && param_strategy.at(IntToSize(axis_)) != 1) {
     MS_LOG(DEBUG) << name_ << ": Invalid strategy. Don't support repeated calc.";
     return FAILED;
   }
@@ -349,13 +345,11 @@ Status GatherV2PInfo::InferDevMatrixShape() {
   } else {
     out_dev_matrix_shape_ = dev_matrix_shape_;
   }
-  CheckGlobalDeviceManager();
-  size_t dev_num = g_device_manager->GetDeviceListByStageId(stage_id_).size();
   auto param_product = std::accumulate(param_strategy.begin(), param_strategy.end(), 1, std::multiplies<int64_t>());
   auto index_product = std::accumulate(index_strategy.begin(), index_strategy.end(), 1, std::multiplies<int64_t>());
-  if (param_product * index_product < SizeToInt(dev_num)) {
+  if (param_product * index_product < stage_device_size_) {
     // add the repeated calculation num to the last dimension of dev matrix
-    out_dev_matrix_shape_.push_back(SizeToInt(dev_num / (param_product * index_product)));
+    out_dev_matrix_shape_.push_back(stage_device_size_ / (param_product * index_product));
   }
 
   return SUCCESS;
@@ -539,11 +533,8 @@ Status GatherV2PInfo::InferGroup() {
     dim = (axis_ + 1) % 2;
   }
 
-  CheckGlobalDeviceManager();
-  MS_EXCEPTION_IF_NULL(g_device_manager);
-  RankList dev_list = g_device_manager->GetDeviceListByStageId(stage_id_);
   int64_t rank = g_device_manager->global_rank();
-  DeviceMatrix dev_matrix(rank, dev_list, dev_matrix_shape_);
+  DeviceMatrix dev_matrix(rank, stage_device_list_, dev_matrix_shape_);
   RankList group_devices;
   if (dev_matrix.GetDevicesAlongDim(SizeToUlong(dim), &group_devices) != SUCCESS) {
     MS_LOG(ERROR) << name_ << ": Create group failed.";
@@ -777,11 +768,10 @@ std::shared_ptr<Strategys> GatherV2PInfo::GenerateBatchStrategies() {
   if (manual_split_) {
     MS_LOG(EXCEPTION) << name_ << ": Manual split does not support to generate batch strategy";
   }
-  CheckGlobalDeviceManager();
-  size_t dev_num = g_device_manager->GetDeviceListByStageId(0).size();
+
   Dimensions param_strategy(inputs_shape_[0].size(), 1);
   Dimensions index_strategy;
-  index_strategy.push_back(SizeToLong(dev_num));
+  index_strategy.push_back(stage_device_size_);
   for (size_t i = 1; i < inputs_shape_[1].size(); i++) {
     index_strategy.push_back(1);
   }
diff --git a/mindspore/ccsrc/frontend/parallel/ops_info/get_next_info.cc b/mindspore/ccsrc/frontend/parallel/ops_info/get_next_info.cc
index b85e63c11e..b836a339d0 100644
--- a/mindspore/ccsrc/frontend/parallel/ops_info/get_next_info.cc
+++ b/mindspore/ccsrc/frontend/parallel/ops_info/get_next_info.cc
@@ -66,7 +66,7 @@ Strategys GetNextInfo::GetOutputStrategy() {
   Strategys outputs_strategy;
   for (auto shp : shapes_) {
     Dimensions out_strategy;
-    out_strategy.push_back(dev_num_);
+    out_strategy.push_back(stage_device_size_);
     for (size_t i = 1; i < shp.size(); ++i) {
       out_strategy.push_back(1);
     }
@@ -97,7 +97,7 @@ Status GetNextInfo::InferDevMatrixShape() {
   if (max_shape_length == 0) {
     MS_LOG(ERROR) << name_ << " : shape is 0";
   }
-  dev_matrix_shape_.push_back(dev_num_);
+  dev_matrix_shape_.push_back(stage_device_size_);
   for (size_t i = 1; i < max_shape_length; ++i) {
     dev_matrix_shape_.push_back(1);
   }
@@ -125,9 +125,6 @@ Status GetNextInfo::CheckStrategy(const StrategyPtr &strategy) {
       return FAILED;
     }
   }
-  int64_t stage = strategy->GetInputStage();
-  int64_t dev_num = SizeToLong(g_device_manager->GetDeviceListByStageId(stage).size());
-  dev_num_ = dev_num;
   return SUCCESS;
 }
 
@@ -199,16 +196,16 @@ Status GetNextInfo::InferReplaceOps(const StrategyPtr &) {
 
   Shapes out_shapes = outputs_shape_;
   for (size_t i = 0; i < out_shapes.size(); ++i) {
-    if (dev_num_ <= 0) {
+    if (stage_device_size_ <= 0) {
       MS_LOG(ERROR) << name_ << " : The dev num is 0.";
       return FAILED;
     }
     if (!full_batch) {
-      if (out_shapes[i][0] % dev_num_ != 0) {
+      if (out_shapes[i][0] % stage_device_size_ != 0) {
         MS_LOG(ERROR) << name_ << " : batch num cannot floor div dev num.";
         return FAILED;
       }
-      out_shapes[i][0] = out_shapes[i][0] / dev_num_;
+      out_shapes[i][0] = out_shapes[i][0] / stage_device_size_;
     }
   }
   ValuePtr new_shapes = MakeValue(out_shapes);
diff --git a/mindspore/ccsrc/frontend/parallel/ops_info/matmul_info.cc b/mindspore/ccsrc/frontend/parallel/ops_info/matmul_info.cc
index 3516222a65..6829766057 100644
--- a/mindspore/ccsrc/frontend/parallel/ops_info/matmul_info.cc
+++ b/mindspore/ccsrc/frontend/parallel/ops_info/matmul_info.cc
@@ -601,10 +601,8 @@ Status MatMulBase::CheckForTensorSliceValid() const {
 }
 
 std::shared_ptr<Strategys> BatchMatMulInfo::GenerateBatchStrategies() {
-  CheckGlobalDeviceManager();
-  size_t dev_num = g_device_manager->GetDeviceListByStageId(0).size();
   Dimensions batch_strategy(inputs_shape_[1].size() - 1, 1);
-  batch_strategy.insert(batch_strategy.begin(), SizeToLong(dev_num));
+  batch_strategy.insert(batch_strategy.begin(), stage_device_size_);
   Strategys strategy_v = {batch_strategy, batch_strategy};
   return std::make_shared<Strategys>(strategy_v);
 }
diff --git a/mindspore/ccsrc/frontend/parallel/ops_info/onehot_info.cc b/mindspore/ccsrc/frontend/parallel/ops_info/onehot_info.cc
index 457cd84420..8a700fb66a 100644
--- a/mindspore/ccsrc/frontend/parallel/ops_info/onehot_info.cc
+++ b/mindspore/ccsrc/frontend/parallel/ops_info/onehot_info.cc
@@ -268,9 +268,7 @@ Status OneHotInfo::GenerateStrategies(int64_t stage_id) {
 Status OneHotInfo::SetCostUnderStrategy(const StrategyPtr &strategy) { return SetCostUnderStrategyBase(strategy); }
 
 std::shared_ptr<Strategys> OneHotInfo::GenerateBatchStrategies() {
-  CheckGlobalDeviceManager();
-  size_t dev_num = g_device_manager->GetDeviceListByStageId(0).size();
-  Dimensions strategy = {SizeToLong(dev_num), 1};
+  Dimensions strategy = {stage_device_size_, 1};
   Dimensions empty_strategy;
   Strategys strategy_v = {strategy, empty_strategy, empty_strategy};
   return std::make_shared<Strategys>(strategy_v);
diff --git a/mindspore/ccsrc/frontend/parallel/ops_info/operator_info.cc b/mindspore/ccsrc/frontend/parallel/ops_info/operator_info.cc
index 4cd500a71c..89003c3aac 100644
--- a/mindspore/ccsrc/frontend/parallel/ops_info/operator_info.cc
+++ b/mindspore/ccsrc/frontend/parallel/ops_info/operator_info.cc
@@ -688,7 +688,7 @@ std::shared_ptr<Strategys> GenerateBatchStrategiesBySplitFlag(const Shapes &shap
     return nullptr;
   }
   CheckGlobalDeviceManager();
-  int64_t dev_num = SizeToLong(g_device_manager->GetDeviceListByStageId(0).size());
+  int64_t dev_num = g_device_manager->stage_device_num();
   Strategys strategy_v;
   for (size_t i = 0; i != shapes.size(); i++) {
     if (shapes[i].empty()) {
@@ -1393,9 +1393,7 @@ Status OperatorInfo::set_outputs_type(const std::vector<TypePtr> &outputs_type)
 
 void OperatorInfo::BreakingTiesForPerferringDataParallel(const StrategyPtr &stra, const CostPtr &cost) {
   if (!stra->GetInputDim().empty() && !stra->GetInputDim()[0].empty()) {
-    CheckGlobalDeviceManager();
-    auto total_device_num = g_device_manager->GetDeviceListByStageId(stra->GetInputStage()).size();
-    if (LongToSize(stra->GetInputDim()[0][0]) == total_device_num) {
+    if (stra->GetInputDim()[0][0] == stage_device_size_) {
       if (cost->computation_cost_ > 1.0) {
         cost->computation_cost_ -= 1.0;
       }
diff --git a/mindspore/ccsrc/frontend/parallel/ops_info/split_info.cc b/mindspore/ccsrc/frontend/parallel/ops_info/split_info.cc
index 26acd68d6c..26f01b7904 100644
--- a/mindspore/ccsrc/frontend/parallel/ops_info/split_info.cc
+++ b/mindspore/ccsrc/frontend/parallel/ops_info/split_info.cc
@@ -233,15 +233,13 @@ std::shared_ptr<Strategys> SplitInfo::GenerateBatchStrategies() {
   if (GetAttrs() != SUCCESS) {
     MS_LOG(EXCEPTION) << name_ << ": Get attr failed";
   }
-  CheckGlobalDeviceManager();
-  size_t dev_num = g_device_manager->GetDeviceListByStageId(0).size();
   Dimensions input_strategy(inputs_shape_[0].size(), 1);
   // axis can't split
   if (inputs_shape_[0].size() > 1) {
     if (axis_ == 0) {
-      input_strategy[1] = dev_num;
+      input_strategy[1] = stage_device_size_;
     } else {
-      input_strategy[0] = dev_num;
+      input_strategy[0] = stage_device_size_;
     }
   }
   Strategys strategy_v = {input_strategy};
diff --git a/mindspore/ccsrc/frontend/parallel/ops_info/tensordot_info.cc b/mindspore/ccsrc/frontend/parallel/ops_info/tensordot_info.cc
index 3bdf626cf8..b08d023f63 100644
--- a/mindspore/ccsrc/frontend/parallel/ops_info/tensordot_info.cc
+++ b/mindspore/ccsrc/frontend/parallel/ops_info/tensordot_info.cc
@@ -408,17 +408,14 @@ std::shared_ptr<Strategys> TensorDotInfo::GenerateBatchStrategies() {
   if (GetAttrs() != SUCCESS) {
     MS_LOG(EXCEPTION) << name_ << ": Get attr failed";
   }
-
-  CheckGlobalDeviceManager();
-  size_t dev_num = g_device_manager->GetDeviceListByStageId(0).size();
   Dimensions input_a_strategy(inputs_shape_[0].size(), 1);
   Dimensions input_b_strategy(inputs_shape_[1].size(), 1);
 
-  input_a_strategy[0] = SizeToInt(dev_num);
+  input_a_strategy[0] = stage_device_size_;
 
   if (axes_type_ == INT_TYPE) {
     if (IntToSize(axes_int_) == inputs_shape_[0].size()) {
-      input_b_strategy[0] = SizeToInt(dev_num);  // find the relavent dimension for input_b
+      input_b_strategy[0] = stage_device_size_;  // find the relavent dimension for input_b
     }
   } else if (axes_type_ == TUPLE_TUPLE_TYPE) {
     // if the input_a's axes contain 0, the input_b has the relavent dimension with batch dimension
@@ -434,7 +431,7 @@ std::shared_ptr<Strategys> TensorDotInfo::GenerateBatchStrategies() {
 
     if (found) {
       // find the relavant
-      input_b_strategy[axes_tuple_tuple_[1][relavant_index]] = dev_num;
+      input_b_strategy[axes_tuple_tuple_[1][relavant_index]] = stage_device_size_;
     }
   } else {
     MS_LOG(EXCEPTION) << name_ << ": Now do not support TUPLE_TYPE";
diff --git a/mindspore/ccsrc/frontend/parallel/ops_info/unique_info.cc b/mindspore/ccsrc/frontend/parallel/ops_info/unique_info.cc
index 118584759f..8b70389d45 100644
--- a/mindspore/ccsrc/frontend/parallel/ops_info/unique_info.cc
+++ b/mindspore/ccsrc/frontend/parallel/ops_info/unique_info.cc
@@ -85,7 +85,7 @@ Status UniqueInfo::InferTensorInfo() {
 }
 
 Status UniqueInfo::InferDevMatrixShape() {
-  dev_matrix_shape_.push_back(dev_num_);
+  dev_matrix_shape_.push_back(stage_device_size_);
   return SUCCESS;
 }
 
@@ -110,9 +110,7 @@ Status UniqueInfo::CheckStrategy(const StrategyPtr &strategy) {
       return FAILED;
     }
   }
-  int64_t stage = strategy->GetInputStage();
-  int64_t dev_num = SizeToLong(g_device_manager->GetDeviceListByStageId(stage).size());
-  dev_num_ = dev_num;
+
   if (stras[0][0] != 1) {
     MS_LOG(ERROR) << "Currently, unique only support repeat calculate in all devices";
     return FAILED;
diff --git a/mindspore/ccsrc/frontend/parallel/ops_info/unsorted_segment_op_info.cc b/mindspore/ccsrc/frontend/parallel/ops_info/unsorted_segment_op_info.cc
index 12288c3f2c..f8316307f9 100644
--- a/mindspore/ccsrc/frontend/parallel/ops_info/unsorted_segment_op_info.cc
+++ b/mindspore/ccsrc/frontend/parallel/ops_info/unsorted_segment_op_info.cc
@@ -277,20 +277,17 @@ std::shared_ptr<Strategys> UnsortedSegmentOpInfo::GenerateBatchStrategies() {
     MS_LOG(EXCEPTION) << name_ << ": inputs shape size must be " << UNSORTEDSEGMENTOP_INPUTS_SIZE << ", but is "
                       << inputs_shape_.size();
   }
-  CheckGlobalDeviceManager();
-  size_t dev_num = g_device_manager->GetDeviceListByStageId(0).size();
   if (GetAttrs() != SUCCESS) {
     MS_LOG(EXCEPTION) << "GetAttrs failed!";
   }
 
-  Dimensions strategy_a;
-  Dimensions strategy_b;
-  strategy_a.push_back(SizeToInt(dev_num));
+  Dimensions strategy_a, strategy_b;
+  strategy_a.push_back(stage_device_size_);
   for (size_t i = 1; i < inputs_shape_[0].size(); i++) {
     strategy_a.push_back(1);
   }
 
-  strategy_b.push_back(SizeToInt(dev_num));
+  strategy_b.push_back(stage_device_size_);
   for (size_t i = 1; i < inputs_shape_[1].size(); i++) {
     strategy_b.push_back(1);
   }
diff --git a/mindspore/ccsrc/frontend/parallel/ops_info/virtual_dataset_info.cc b/mindspore/ccsrc/frontend/parallel/ops_info/virtual_dataset_info.cc
index 871758409f..c8fa56f5d4 100644
--- a/mindspore/ccsrc/frontend/parallel/ops_info/virtual_dataset_info.cc
+++ b/mindspore/ccsrc/frontend/parallel/ops_info/virtual_dataset_info.cc
@@ -66,13 +66,10 @@ Status VirtualDatasetInfo::CheckStrategy(const StrategyPtr &strategy) {
 Status VirtualDatasetInfo::InferDevMatrixShape() {
   Strategys stra = strategy_->GetInputDim();
   Dimensions strategy_first = stra.at(0);
-  int64_t stage = strategy_->GetInputStage();
-  CheckGlobalDeviceManager();
-  int64_t dev_num = SizeToLong(g_device_manager->GetDeviceListByStageId(stage).size());
   int64_t batch_split_num = ((int64_t)(strategy_first.at(0)));
   dev_matrix_shape_.push_back(batch_split_num);
-  if (dev_num > batch_split_num) {
-    dev_matrix_shape_.push_back(dev_num / batch_split_num);
+  if (stage_device_size_ > batch_split_num) {
+    dev_matrix_shape_.push_back(stage_device_size_ / batch_split_num);
   }
 
   return SUCCESS;
@@ -156,11 +153,10 @@ Status VirtualDatasetInfo::GenerateStrategies(int64_t stage_id) {
     return FAILED;
   }
 
-  CheckGlobalDeviceManager();
   if (full_batch) {
     total_dev_num = 1;
   } else {
-    total_dev_num = g_device_manager->GetDeviceListByStageId(stage_id).size();
+    total_dev_num = stage_device_size_;
   }
   StrategyPtr sp;
   Strategys strategy;
diff --git a/mindspore/ccsrc/frontend/parallel/step_parallel.cc b/mindspore/ccsrc/frontend/parallel/step_parallel.cc
index a5d28584d5..a3a76b40b1 100644
--- a/mindspore/ccsrc/frontend/parallel/step_parallel.cc
+++ b/mindspore/ccsrc/frontend/parallel/step_parallel.cc
@@ -1640,7 +1640,7 @@ void SetVirtualDatasetStrategy(const CNodePtr &node) {
     if (full_batch) {
       dev_num = 1;
     } else {
-      dev_num = SizeToLong(g_device_manager->GetDeviceListByStageId(0).size());
+      dev_num = SizeToLong(g_device_manager->stage_device_num());
     }
     auto attrs_temp = prim->attrs();
     std::vector<Shapes> shape_list = ExtractShape(node);
@@ -1984,7 +1984,7 @@ std::shared_ptr<TensorLayout> CreateParameterLayout(const AnfNodePtr &node) {
     return next_layout;
   }
   CheckGlobalDeviceManager();
-  int64_t dev_num = SizeToLong(g_device_manager->GetDeviceListByStageId(0).size());
+  int64_t dev_num = g_device_manager->stage_device_num();
   TensorLayout input_tensor_layout;
   // create input_shape
   Shapes inputs_shape = GetNodeShape(node);
@@ -2009,7 +2009,7 @@ RedistributionOpListPtr InferSensRedistribution(const AnfNodePtr &node, const Te
   TensorRedistribution tensor_redistribution;
   // create stand alone layout:TensorMap:[all -1],dev_matrix:[dev_num].
   CheckGlobalDeviceManager();
-  int64_t dev_num = SizeToLong(g_device_manager->GetDeviceListByStageId(0).size());
+  int64_t dev_num = g_device_manager->stage_device_num();
   TensorLayout stand_alone_layout;
   Shapes inputs_shape = GetNodeShape(node);
   if (inputs_shape.empty()) {
@@ -2029,7 +2029,7 @@ RedistributionOpListPtr InferSensRedistribution(const AnfNodePtr &node, const Te
   }
 
   // Infer Redistribution op list for stand alone and loss layout.
-  RankList dev_list = g_device_manager->GetDeviceListByStageId(0);
+  RankList dev_list = g_device_manager->GetDeviceListInThisStage();
   if (tensor_redistribution.Init(stand_alone_layout, loss_layout, dev_list) == FAILED) {
     MS_LOG(EXCEPTION) << "Redistribution for Sens init failed.";
   }
@@ -3093,7 +3093,7 @@ static void HandleNoUsedParameter(const FuncGraphPtr &root) {
   if (full_batch) {
     return;
   }
-  auto dev_num = g_device_manager->GetDeviceListByStageId(0).size();
+  auto dev_num = g_device_manager->stage_device_num();
   auto parameters = root->parameters();
   for (auto &parameter : parameters) {
     if (IsUsedParameter(root, parameter)) {