diff --git a/mindspore/ccsrc/device/ascend/ascend_stream_assign.cc b/mindspore/ccsrc/device/ascend/ascend_stream_assign.cc
index 736d6203e9..971b67af01 100644
--- a/mindspore/ccsrc/device/ascend/ascend_stream_assign.cc
+++ b/mindspore/ccsrc/device/ascend/ascend_stream_assign.cc
@@ -48,6 +48,12 @@ void AscendStreamAssign::AssignStream(const NotNull<KernelGraphPtr> &graph_ptr)
     CheckResourceAssign(graph_ptr);
     MS_LOG(INFO) << "After finish stream assign";
 
+    FindStreamRelations(graph_ptr);
+    PrintStreamRelations();
+    GetStreamRelations();
+    PrintStreamGroups();
+    FindEventRelations(graph_ptr);
+
     // Get info for D Model
     AscendResourceMng &resource_manager = AscendResourceMng::GetInstance();
     generator::IRModelUtil::GetInstance().set_event_num(resource_manager.get_cur_event_num());
@@ -501,6 +507,8 @@ void AscendStreamAssign::InsertEventHcomDependCommon(const NotNull<KernelGraphPt
       auto recv = CreateRecvApplyKernel(graph_ptr, cur_event_id, cur_stream_id);
       cnodes.emplace_back(recv);
       cnodes.emplace_back(cur_cnode_ptr);
+    } else {
+      cnodes.emplace_back(cur_cnode_ptr);
     }
     pre_stream_id = cur_stream_id;
   }
@@ -910,7 +918,351 @@ void AscendStreamAssign::Reset() {
   common_stream_map_.clear();
   processed_streams_.clear();
   need_first_active_streams_.clear();
+  stream_groups_.clear();
+  stream_relations_.clear();
+  event_map_.clear();
+}
+
+// section 10
+bool AscendStreamAssign::IsVecExist(std::vector<uint32_t> *group) {
+  auto group_size = group->size();
+  if (group_size == 0) {
+    return false;
+  }
+  for (const auto &item : stream_groups_) {
+    if (item.size() < group->size()) {
+      continue;
+    }
+
+    bool flag = true;
+    for (size_t i = 0; i < group_size; i++) {
+      if (item[i] != group->at(i)) {
+        flag = false;
+        break;
+      }
+    }
+
+    if (flag) {
+      return true;
+    } else {
+      continue;
+    }
+  }
+
+  return false;
 }
+
+void AscendStreamAssign::DFS(uint32_t start, std::vector<uint32_t> *group) {
+  auto it = stream_relations_.find(start);
+  if (it == stream_relations_.end()) {
+    if (!IsVecExist(group)) {
+      stream_groups_.emplace_back(*group);
+    } else {
+      MS_LOG(WARNING) << "DFS should not print this log";
+    }
+    return;
+  }
+
+  vector<uint32_t> active_streams = stream_relations_[start];
+
+  for (const auto &item : active_streams) {
+    group->emplace_back(item);
+    DFS(item, group);
+    group->pop_back();
+  }
+}
+
+void AscendStreamAssign::GetStreamRelations() {
+  for (const auto &start : need_first_active_streams_) {
+    vector<uint32_t> group{start};
+    DFS(start, &group);
+  }
+}
+
+void AscendStreamAssign::FindStreamRelations(const NotNull<KernelGraphPtr> &graph_ptr) {
+  AscendResourceMng &resource_manager = AscendResourceMng::GetInstance();
+  auto stream_num = resource_manager.get_cur_stream_num();
+  if (stream_num <= 1) {
+    return;
+  }
+
+  auto exe_orders = graph_ptr->execution_order();
+  for (size_t i = 0; i < exe_orders.size(); i++) {
+    auto cur_cnode = exe_orders[i];
+    auto name = AnfAlgo::GetCNodeName(cur_cnode);
+    if (name != kStreamSwitchOpName && name != kStreamActiveOpName) {
+      continue;
+    }
+
+    // support:streamswitch is begin of the stream
+    if (name == kStreamSwitchOpName) {
+      GetStreamSwitchStreamRelation(cur_cnode);
+    }
+
+    if (name == kStreamActiveOpName) {
+      GetStreamActiveStreamRelation(graph_ptr, i);
+    }
+  }
+}
+
+void AscendStreamAssign::GetStreamSwitchStreamRelation(const CNodePtr &node_ptr) {
+  MS_EXCEPTION_IF_NULL(node_ptr);
+  auto cur_stream_id = AnfAlgo::GetStreamId(node_ptr);
+  auto true_stream_id = AnfAlgo::GetNodeAttr<uint32_t>(node_ptr, kAttrTrueBranchStream);
+  if (true_stream_id <= cur_stream_id) {
+    MS_LOG(ERROR) << "StreamSwitch self stream id " << cur_stream_id
+                  << " is greater than true branch stream id:" << true_stream_id;
+  }
+  auto it = stream_relations_.find(cur_stream_id);
+  if (it == stream_relations_.end()) {
+    stream_relations_[cur_stream_id] = {true_stream_id};
+  } else {
+    auto iter =
+      std::find(stream_relations_[cur_stream_id].begin(), stream_relations_[cur_stream_id].end(), true_stream_id);
+    if (iter == stream_relations_[cur_stream_id].end()) {
+      stream_relations_[cur_stream_id].emplace_back(true_stream_id);
+    }
+  }
+}
+
+void AscendStreamAssign::GetStreamActiveStreamRelation(const NotNull<KernelGraphPtr> &graph_ptr, size_t index) {
+  StreamActiveKind kind = GetStreamActiveKind(graph_ptr, index);
+  if (kind == kInvalid) {
+    MS_LOG(INFO) << "Invalid streamActive kind";
+    return;
+  }
+
+  auto orders = graph_ptr->execution_order();
+  auto cur_cnode = orders[index];
+  auto cur_stream_id = AnfAlgo::GetStreamId(cur_cnode);
+  auto active_list = AnfAlgo::GetNodeAttr<vector<uint32_t>>(cur_cnode, kAttrActiveStreamList);
+  if (kind == kHead) {
+    uint32_t active_current_node = GetStreamByActivedStream(cur_stream_id);
+    if (active_current_node == kInvalidStreamId) {
+      MS_LOG(EXCEPTION) << "No stream to active streamactive stream";
+    }
+
+    for (const auto &item : active_list) {
+      if (item <= active_current_node) {
+        MS_LOG(WARNING) << "Actived stream is less than activing stream";
+        continue;
+      }
+      auto it =
+        std::find(stream_relations_[active_current_node].begin(), stream_relations_[active_current_node].end(), item);
+      if (it == stream_relations_[active_current_node].end()) {
+        stream_relations_[active_current_node].emplace_back(item);
+      }
+    }
+  }
+
+  if (kind == kMiddle) {
+    for (const auto &stream : active_list) {
+      if (stream <= cur_stream_id) {
+        MS_LOG(INFO) << "MIDDLE StreamActive active stream is less than self stream, no need deal";
+      } else {
+        MS_LOG(ERROR) << "MIDDLE StreamActive active stream is greater than self stream, should not be exit now";
+      }
+    }
+  }
+
+  if (kind == kTail) {
+    auto it = stream_relations_.find(cur_stream_id);
+    if (it == stream_relations_.end()) {
+      stream_relations_[cur_stream_id] = active_list;
+    } else {
+      for (const auto &stream : active_list) {
+        if (stream <= cur_stream_id) {
+          MS_LOG(WARNING) << "Actived stream is less than activing stream";
+          continue;
+        }
+        auto iter = std::find(stream_relations_[cur_stream_id].begin(), stream_relations_[cur_stream_id].end(), stream);
+        if (iter == stream_relations_[cur_stream_id].end()) {
+          stream_relations_[cur_stream_id].emplace_back(stream);
+        }
+      }
+    }
+  }
+}
+
+StreamActiveKind AscendStreamAssign::GetStreamActiveKind(const NotNull<KernelGraphPtr> &graph_ptr, size_t index) {
+  auto exe_orders = graph_ptr->execution_order();
+  if (index >= exe_orders.size()) {
+    MS_LOG(EXCEPTION) << "Invalid op index:" << index;
+  }
+
+  auto cur_cnode = exe_orders[index];
+  auto cur_stream_id = AnfAlgo::GetStreamId(cur_cnode);
+  if (AnfAlgo::GetCNodeName(cur_cnode) != kStreamActiveOpName) {
+    MS_LOG(EXCEPTION) << "Current node name is not StreamActive";
+  }
+
+  if (index == 0) {
+    return kInvalid;
+  }
+
+  if (index == exe_orders.size() - 1) {
+    return kInvalid;
+  }
+
+  uint32_t pre_stream_id = UINT32_MAX;
+  uint32_t next_stream_id = UINT32_MAX;
+  int32_t start = SizeToInt(index);
+  for (int32_t i = start; i >= 0; i--) {
+    auto cnode = exe_orders[IntToSize(i)];
+    auto name = AnfAlgo::GetCNodeName(cnode);
+    if (name == kSendOpName || name == kRecvOpName) {
+      continue;
+    }
+
+    pre_stream_id = AnfAlgo::GetStreamId(cnode);
+    break;
+  }
+
+  for (size_t i = index + 1; i < exe_orders.size(); i++) {
+    auto cnode = exe_orders[i];
+    auto name = AnfAlgo::GetCNodeName(cnode);
+    if (name == kSendOpName || name == kRecvOpName) {
+      continue;
+    }
+
+    next_stream_id = AnfAlgo::GetStreamId(cnode);
+    break;
+  }
+
+  // pre_stream_id = UINT32_MAX:means no node active current StreamActive
+  // next_stream_id = UINT32_MAX:means current StreamActive active no node
+  if (pre_stream_id == UINT32_MAX || next_stream_id == UINT32_MAX) {
+    return kInvalid;
+  }
+
+  if (cur_stream_id == pre_stream_id && cur_stream_id == next_stream_id) {
+    return kMiddle;
+  }
+
+  if (cur_stream_id == pre_stream_id) {
+    return kTail;
+  }
+
+  if (cur_stream_id == next_stream_id) {
+    return kHead;
+  }
+
+  return kInvalid;
+}
+
+uint32_t AscendStreamAssign::GetStreamByActivedStream(uint32_t actived_stream_id) {
+  if (stream_relations_.empty()) {
+    return kInvalidStreamId;
+  }
+
+  for (const auto &item : stream_relations_) {
+    auto it = std::find(item.second.begin(), item.second.end(), actived_stream_id);
+    if (it != item.second.end()) {
+      return item.first;
+    }
+  }
+
+  return kInvalidStreamId;
+}
+
+void AscendStreamAssign::PrintStreamRelations() {
+  MS_LOG(INFO) << "Stream relations size:" << stream_relations_.size();
+  for (const auto &item : stream_relations_) {
+    MS_LOG(INFO) << "Stream:" << item.first;
+    for (const auto &stream : item.second) {
+      MS_LOG(INFO) << "--actived stream id:" << stream;
+    }
+  }
+}
+
+void AscendStreamAssign::PrintStreamGroups() {
+  MS_LOG(INFO) << "Stream group size:" << stream_groups_.size();
+  for (const auto &item : stream_groups_) {
+    MS_LOG(INFO) << "Group:";
+    for (const auto &stream : item) {
+      MS_LOG(INFO) << "Stream id:" << stream;
+    }
+  }
+}
+
+// section 11
+bool AscendStreamAssign::IsSatisfiedEvent(uint32_t send_stream_id, uint32_t recv_stream_id) const {
+  size_t send_group = 0;
+  size_t recv_group = 0;
+  bool send_flag = true;
+  bool recv_flag = true;
+  for (size_t i = 0; i < stream_groups_.size(); i++) {
+    auto group = stream_groups_[i];
+    if (send_flag) {
+      auto it = std::find(group.begin(), group.end(), send_stream_id);
+      if (it != group.end()) {
+        send_group = i;
+        send_flag = false;
+      }
+    }
+
+    if (recv_flag) {
+      auto it = std::find(group.begin(), group.end(), recv_stream_id);
+      if (it != group.end()) {
+        recv_group = i;
+        recv_flag = false;
+      }
+    }
+  }
+
+  if (!(send_flag || recv_flag)) {
+    return (send_group != recv_group);
+  }
+
+  return false;
+}
+
+void AscendStreamAssign::FindEventRelations(const NotNull<KernelGraphPtr> &graph_ptr) {
+  AscendResourceMng &resource_manager = AscendResourceMng::GetInstance();
+  auto event_nums = resource_manager.get_cur_event_num();
+  if (event_nums == 0) {
+    return;
+  }
+  auto exe_orders = graph_ptr->execution_order();
+  // find all event info
+  for (size_t i = 0; i < exe_orders.size(); i++) {
+    auto cur_cnode = exe_orders[i];
+    auto name = AnfAlgo::GetCNodeName(cur_cnode);
+    if (name == kSendOpName) {
+      event_map_[cur_cnode] = {};
+    }
+
+    if (name == kRecvOpName) {
+      auto recv_event_id = AnfAlgo::GetNodeAttr<uint32_t>(cur_cnode, kAttrEventId);
+      for (auto &item : event_map_) {
+        auto send_event_id = AnfAlgo::GetNodeAttr<uint32_t>(item.first, kAttrEventId);
+        if (recv_event_id == send_event_id) {
+          item.second = cur_cnode;
+          break;
+        }
+      }
+    }
+  }
+
+  // delete useless event info
+  auto begin = event_map_.begin();
+  while (begin != event_map_.end()) {
+    auto send_stream_id = AnfAlgo::GetStreamId(begin->first);
+    auto recv_stream_id = AnfAlgo::GetStreamId(begin->second);
+    bool flag = IsSatisfiedEvent(send_stream_id, recv_stream_id);
+    if (!flag) {
+      begin = event_map_.erase(begin);
+    } else {
+      begin++;
+    }
+  }
+
+  MS_LOG(INFO) << "Satisfied event info";
+  for (const auto &item : event_map_) {
+    MS_LOG(INFO) << "Event_id:" << AnfAlgo::GetNodeAttr<uint32_t>(item.first, kAttrEventId);
+  }
+}
+
 }  // namespace ascend
 }  // namespace device
 }  // namespace mindspore
diff --git a/mindspore/ccsrc/device/ascend/ascend_stream_assign.h b/mindspore/ccsrc/device/ascend/ascend_stream_assign.h
index 625ab6ad6e..d268e0c975 100644
--- a/mindspore/ccsrc/device/ascend/ascend_stream_assign.h
+++ b/mindspore/ccsrc/device/ascend/ascend_stream_assign.h
@@ -94,6 +94,7 @@ class AscendResourceMng {
   uint32_t cur_event_num_{0};
 };
 
+enum StreamActiveKind { kInvalid = 0, kHead, kMiddle, kTail };
 class AscendStreamAssign {
  public:
   static AscendStreamAssign &GetInstance() {
@@ -109,6 +110,8 @@ class AscendStreamAssign {
   void GetWaitStreams(vector<uint32_t> *wait_active_stream_list);
   CNodePtr CreateSendApplyKernel(const NotNull<KernelGraphPtr> &graph_ptr, uint32_t event_id, uint32_t stream_id);
   CNodePtr CreateRecvApplyKernel(const NotNull<KernelGraphPtr> &graph_ptr, uint32_t event_id, uint32_t stream_id);
+  const std::vector<std::vector<uint32_t>> &get_stream_group() const { return stream_groups_; }
+  const std::map<CNodePtr, CNodePtr> &get_event_map() const { return event_map_; }
 
  private:
   AscendStreamAssign() = default;
@@ -147,6 +150,20 @@ class AscendStreamAssign {
                                           const CNodePtr &node);
   void GetParallelStream(uint32_t cur_stream_id, uint32_t stream_acitve_id, std::vector<uint32_t> *parallel_streams);
 
+  // function for memory resue
+  void GetStreamRelations();
+  void DFS(uint32_t start, std::vector<uint32_t> *group);
+  bool IsVecExist(std::vector<uint32_t> *group);
+  void FindStreamRelations(const NotNull<KernelGraphPtr> &graph_ptr);
+  void GetStreamSwitchStreamRelation(const CNodePtr &node_ptr);
+  void GetStreamActiveStreamRelation(const NotNull<KernelGraphPtr> &graph_ptr, size_t index);
+  StreamActiveKind GetStreamActiveKind(const NotNull<KernelGraphPtr> &graph_ptr, size_t index);
+  uint32_t GetStreamByActivedStream(uint32_t actived_stream_id);
+  void PrintStreamRelations();
+  void PrintStreamGroups();
+  void FindEventRelations(const NotNull<KernelGraphPtr> &graph_ptr);
+  bool IsSatisfiedEvent(uint32_t send_stream_id, uint32_t recv_stream_id) const;
+
   bool independent_stream_activated_{false};
   bool hcom_stream_activated_{false};
   std::map<uint32_t, uint32_t> independent_stream_map_{};
@@ -154,6 +171,11 @@ class AscendStreamAssign {
   std::map<uint32_t, uint32_t> common_stream_map_{};
   std::set<uint32_t> processed_streams_{};
   std::vector<uint32_t> need_first_active_streams_{};
+
+  // attr for memory copy reuse
+  std::map<uint32_t, std::vector<uint32_t>> stream_relations_{};
+  std::vector<std::vector<uint32_t>> stream_groups_{};
+  std::map<CNodePtr, CNodePtr> event_map_;
   // new policy end
 };
 }  // namespace ascend