diff --git a/mindspore/ccsrc/ps/core/communicator/communicator_base.cc b/mindspore/ccsrc/ps/core/communicator/communicator_base.cc
index 7ce0a5332aa..94b0b8d3e1b 100644
--- a/mindspore/ccsrc/ps/core/communicator/communicator_base.cc
+++ b/mindspore/ccsrc/ps/core/communicator/communicator_base.cc
@@ -20,6 +20,11 @@
 namespace mindspore {
 namespace ps {
 namespace core {
+CommunicatorBase::~CommunicatorBase() {
+  running_ = false;
+  Join();
+}
+
 bool CommunicatorBase::SendResponse(const void *rsp_data, size_t rsp_len, std::shared_ptr<MessageHandler> msg_handler) {
   // The rsp_len could be 0 because of ProtoBuffer's feature.
   if (rsp_data == nullptr || msg_handler == nullptr) {
diff --git a/mindspore/ccsrc/ps/core/communicator/communicator_base.h b/mindspore/ccsrc/ps/core/communicator/communicator_base.h
index 0ca32f542da..15733fc993e 100644
--- a/mindspore/ccsrc/ps/core/communicator/communicator_base.h
+++ b/mindspore/ccsrc/ps/core/communicator/communicator_base.h
@@ -42,9 +42,9 @@ class CommunicatorBase {
   using OnNodeEventCallback = std::function<void(const ClusterEvent &)>;
   using TcpMsgCallback = std::function<void(std::shared_ptr<core::TcpConnection> conn,
                                             std::shared_ptr<core::MessageMeta> meta, DataPtr data, size_t size)>;
-  CommunicatorBase() = default;
+  CommunicatorBase() : running_(false) {}
 
-  virtual ~CommunicatorBase() = default;
+  virtual ~CommunicatorBase();
 
   virtual bool Start() = 0;
   virtual bool Stop() = 0;
@@ -59,6 +59,7 @@ class CommunicatorBase {
  protected:
   std::unordered_map<std::string, MessageCallback> msg_callbacks_;
   std::thread running_thread_;
+  bool running_;
 };
 }  // namespace core
 }  // namespace ps
diff --git a/mindspore/ccsrc/ps/core/communicator/http_communicator.cc b/mindspore/ccsrc/ps/core/communicator/http_communicator.cc
index cdc8556b00f..fbcc7282ff9 100644
--- a/mindspore/ccsrc/ps/core/communicator/http_communicator.cc
+++ b/mindspore/ccsrc/ps/core/communicator/http_communicator.cc
@@ -31,10 +31,8 @@ bool HttpCommunicator::Start() {
   MS_LOG(INFO) << "Http communicator started.";
 
   running_thread_ = std::thread([&]() {
-    try {
-      http_server_->Wait();
-    } catch (const std::exception &e) {
-      MsException::Instance().SetException();
+    while (running_) {
+      std::this_thread::yield();
     }
   });
   return true;
@@ -42,7 +40,9 @@ bool HttpCommunicator::Start() {
 
 bool HttpCommunicator::Stop() {
   MS_EXCEPTION_IF_NULL(http_server_);
-  return http_server_->Stop();
+  bool res = http_server_->Stop();
+  running_ = false;
+  return res;
 }
 
 void HttpCommunicator::RegisterMsgCallBack(const std::string &msg_type, const MessageCallback &cb) {
diff --git a/mindspore/ccsrc/ps/core/communicator/http_server.cc b/mindspore/ccsrc/ps/core/communicator/http_server.cc
index 60a78335f32..57a7d39efda 100644
--- a/mindspore/ccsrc/ps/core/communicator/http_server.cc
+++ b/mindspore/ccsrc/ps/core/communicator/http_server.cc
@@ -115,13 +115,17 @@ bool HttpServer::RegisterRoute(const std::string &url, OnRequestReceive *functio
   return true;
 }
 
-bool HttpServer::Start() {
+bool HttpServer::Start(bool is_detach) {
   MS_LOG(INFO) << "Start http server!";
   for (size_t i = 0; i < thread_num_; i++) {
     auto http_request_handler = std::make_shared<HttpRequestHandler>();
     http_request_handler->Initialize(fd_, request_handlers_);
     http_request_handlers.push_back(http_request_handler);
-    worker_threads_.emplace_back(std::make_shared<std::thread>(&HttpRequestHandler::Run, http_request_handler));
+    auto thread = std::make_shared<std::thread>(&HttpRequestHandler::Run, http_request_handler);
+    if (is_detach) {
+      thread->detach();
+    }
+    worker_threads_.emplace_back(thread);
   }
   return true;
 }
diff --git a/mindspore/ccsrc/ps/core/communicator/http_server.h b/mindspore/ccsrc/ps/core/communicator/http_server.h
index 62736822ed1..e55c00320d6 100644
--- a/mindspore/ccsrc/ps/core/communicator/http_server.h
+++ b/mindspore/ccsrc/ps/core/communicator/http_server.h
@@ -64,7 +64,7 @@ class HttpServer {
   // Return: true if success, false if failed, check log to find failure reason
   bool RegisterRoute(const std::string &url, OnRequestReceive *func);
 
-  bool Start();
+  bool Start(bool is_detach = true);
   bool Wait();
   bool Stop();
 
diff --git a/mindspore/ccsrc/ps/core/communicator/tcp_communicator.h b/mindspore/ccsrc/ps/core/communicator/tcp_communicator.h
index befbcdf26f0..a0675ff9a29 100644
--- a/mindspore/ccsrc/ps/core/communicator/tcp_communicator.h
+++ b/mindspore/ccsrc/ps/core/communicator/tcp_communicator.h
@@ -65,7 +65,6 @@ class TcpCommunicator : public CommunicatorBase {
  public:
   explicit TcpCommunicator(const std::shared_ptr<TaskExecutor> &task_executor, ServerNode *node)
       : task_executor_(task_executor),
-        running_(false),
         server_num_(0),
         worker_num_(0),
         scheduler_ip_(""),
@@ -109,7 +108,6 @@ class TcpCommunicator : public CommunicatorBase {
 
  private:
   std::shared_ptr<TaskExecutor> task_executor_;
-  bool running_;
 
   TcpMsgCallback tcp_msg_callback_;
   OnNodeEventCallback event_callback_;
diff --git a/mindspore/ccsrc/ps/core/scheduler_node.cc b/mindspore/ccsrc/ps/core/scheduler_node.cc
index d5fb6f54ccb..690fb982ca3 100644
--- a/mindspore/ccsrc/ps/core/scheduler_node.cc
+++ b/mindspore/ccsrc/ps/core/scheduler_node.cc
@@ -429,6 +429,7 @@ void SchedulerNode::ProcessScaleOut(std::shared_ptr<HttpMessageHandler> resp) {
   nlohmann::json js;
   js["message"] = "Cluster begin to scale out.";
   resp->AddRespString(js.dump());
+  resp->AddRespHeadParam("Content_Type", "application/json");
 
   resp->SetRespCode(HTTP_OK);
   resp->SendResponse();
@@ -507,6 +508,7 @@ void SchedulerNode::ProcessScaleIn(std::shared_ptr<HttpMessageHandler> resp) {
   nlohmann::json js;
   js["message"] = "Cluster begin to scale in.";
   resp->AddRespString(js.dump());
+  resp->AddRespHeadParam("Content_Type", "application/json");
 
   resp->SetRespCode(HTTP_OK);
   resp->SendResponse();
@@ -543,6 +545,7 @@ void SchedulerNode::ProcessGetNodesInfo(std::shared_ptr<HttpMessageHandler> resp
   }
 
   resp->AddRespString(js.dump());
+  resp->AddRespHeadParam("Content_Type", "application/json");
 
   resp->SetRespCode(HTTP_OK);
   resp->SendResponse();
@@ -562,6 +565,7 @@ void SchedulerNode::ProcessGetClusterState(std::shared_ptr<HttpMessageHandler> r
   js["cluster_state"] = CommUtil::ClusterStateToString(cluster_state);
 
   resp->AddRespString(js.dump());
+  resp->AddRespHeadParam("Content_Type", "application/json");
 
   resp->SetRespCode(HTTP_OK);
   resp->SendResponse();
@@ -601,6 +605,13 @@ RequestProcessResult SchedulerNode::CheckIfNodeIdLegal(const std::vector<std::st
       ERROR_STATUS(result, RequestProcessResultCode::kInvalidInputs, error_message);
       return result;
     }
+
+    if (node_infos[val].node_role_ == NodeRole::WORKER) {
+      std::string error_message = "The node id:" + val + " is the role of worker, should not be scale in.";
+      MS_LOG(ERROR) << error_message;
+      ERROR_STATUS(result, RequestProcessResultCode::kInvalidInputs, error_message);
+      return result;
+    }
   }
 
   return result;
@@ -628,7 +639,7 @@ void SchedulerNode::StartRestfulServer(const std::string &address, std::uint16_t
 
   http_server_->InitServer();
 
-  http_server_->Start();
+  http_server_->Start(false);
   restful_thread_ = std::make_unique<std::thread>([&]() { http_server_->Wait(); });
 }
 
diff --git a/mindspore/ccsrc/ps/core/server_node.cc b/mindspore/ccsrc/ps/core/server_node.cc
index fc176d53bf5..09fbc0854a7 100644
--- a/mindspore/ccsrc/ps/core/server_node.cc
+++ b/mindspore/ccsrc/ps/core/server_node.cc
@@ -77,6 +77,7 @@ void ServerNode::CreateTcpServer() {
     MS_LOG(INFO) << "The server node start a tcp server!";
     this->server_->Start();
   });
+  server_thread_->detach();
 }
 
 void ServerNode::Initialize() {
@@ -158,20 +159,13 @@ bool ServerNode::Stop() {
   if (!is_already_stopped_.load()) {
     is_already_stopped_ = true;
     is_finish_ = true;
-    if (heart_beat_thread_->joinable()) {
-      heart_beat_thread_->join();
-    }
     client_to_scheduler_->Stop();
     if (!connected_nodes_.empty()) {
       for (auto &connected_node : connected_nodes_) {
         connected_node.second->Stop();
       }
     }
-    if (client_to_scheduler_thread_->joinable()) {
-      client_to_scheduler_thread_->join();
-    }
     server_->Stop();
-    server_thread_->join();
   }
   return true;
 }
diff --git a/mindspore/ccsrc/ps/core/worker_node.cc b/mindspore/ccsrc/ps/core/worker_node.cc
index 073421d6feb..80446f2a0af 100644
--- a/mindspore/ccsrc/ps/core/worker_node.cc
+++ b/mindspore/ccsrc/ps/core/worker_node.cc
@@ -68,6 +68,7 @@ void WorkerNode::CreateTcpServer() {
     MS_LOG(INFO) << "The worker node start a tcp server!";
     server_->Start();
   });
+  server_thread_->detach();
 }
 
 bool WorkerNode::Stop() {
@@ -82,7 +83,6 @@ bool WorkerNode::Stop() {
       }
     }
     server_->Stop();
-    server_thread_->join();
     is_already_stopped_ = true;
   }
   return true;