diff --git a/paddle/operators/detail/CMakeLists.txt b/paddle/operators/detail/CMakeLists.txt
index f6bdc63cc2cfae526fe911ee4d989675452d5c5d..571a75c9dcd903672d460f192bf28ddbeaea7c78 100644
--- a/paddle/operators/detail/CMakeLists.txt
+++ b/paddle/operators/detail/CMakeLists.txt
@@ -1 +1 @@
-grpc_library(sendrecvop_grpc SRCS recv_impl.cc send_impl.cc PROTO send_recv.proto DEPS lod_tensor selected_rows)
+grpc_library(sendrecvop_grpc SRCS sendrecvop_utils.cc grpc_client.cc grpc_server.cc PROTO send_recv.proto DEPS lod_tensor selected_rows)
diff --git a/paddle/operators/detail/grpc_client.cc b/paddle/operators/detail/grpc_client.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5a4db2d7e686ce84abef620f890be8f3aa82cb73
--- /dev/null
+++ b/paddle/operators/detail/grpc_client.cc
@@ -0,0 +1,147 @@
+/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License. */
+
+#include "grpc_client.h"
+namespace paddle {
+namespace operators {
+namespace detail {
+
+bool RPCClient::AsyncSendVariable(const std::string& ep,
+                                  const platform::DeviceContext& ctx,
+                                  const framework::Scope& scope,
+                                  const std::string& var_name,
+                                  int64_t time_out) {
+  sendrecv::VariableMessage req;
+  auto* var = scope.FindVar(var_name);
+  SerializeToMessage(var_name, var, ctx, &req);
+
+  // varhandle
+  VarHandle var_h;
+  var_h.ep = ep;
+  var_h.scope = &scope;
+  var_h.name = var_name;
+  var_h.ctx = &ctx;
+
+  // stub context
+  auto ch = GetChannel(ep);
+  SendProcessor* s = new SendProcessor(ch);
+  s->Prepare(var_h, time_out);
+  s->response_call_back_ = NULL;
+
+  auto rpc = s->stub_->AsyncSendVariable(s->context_.get(), req, &cq_);
+  rpc->Finish(&s->reply_, &s->status_, (void*)s);
+
+  req_count_++;
+
+  return true;
+}
+
+void ProcGetResponse(const VarHandle& var_h,
+                     const sendrecv::VariableMessage& ret_msg) {
+  auto* outvar = var_h.scope->FindVar(var_h.name);
+
+  std::istringstream iss(ret_msg.serialized());
+  DeserializeFromMessage(ret_msg, *var_h.ctx, outvar);
+}
+
+bool RPCClient::AsyncGetVariable(const std::string& ep,
+                                 const platform::DeviceContext& ctx,
+                                 const framework::Scope& scope,
+                                 const std::string& var_name,
+                                 int64_t time_out) {
+  sendrecv::VariableMessage req;
+  req.set_varname(var_name);
+
+  auto* var = scope.FindVar(var_name);
+  SerializeToMessage(var_name, var, ctx, &req);
+
+  // varhandle
+  VarHandle var_h;
+  var_h.ep = ep;
+  var_h.scope = &scope;
+  var_h.name = var_name;
+  var_h.ctx = &ctx;
+
+  // stub context
+  auto ch = GetChannel(ep);
+  GetProcessor* s = new GetProcessor(ch);
+  s->Prepare(var_h, time_out);
+  s->response_call_back_ = ProcGetResponse;
+
+  auto rpc = s->stub_->AsyncGetVariable(s->context_.get(), req, &cq_);
+  rpc->Finish(&s->reply_, &s->status_, (void*)s);
+
+  req_count_++;
+
+  return true;
+}
+
+bool RPCClient::wait() {
+  bool ok = true;
+
+  while (true) {
+    if (req_count_ <= 0) {
+      break;
+    }
+
+    if (!Proceed()) {
+      LOG(ERROR) << "Get meets CompletionQueue error";
+      return false;
+    }
+  }
+
+  return ok;
+}
+
+bool RPCClient::Proceed() {
+  void* tag = NULL;
+  bool ok = false;
+
+  // request counts.
+  if (!cq_.Next(&tag, &ok)) {
+    return false;
+  }
+  req_count_--;
+
+  GPR_ASSERT(ok);
+  PADDLE_ENFORCE(tag);
+
+  // TODO(gongwb): add more retries.
+  ClientBase* c = static_cast<ClientBase*>(tag);
+  if (!c->status_.ok()) {
+    delete c;
+    return true;
+  }
+
+  c->Process();
+  delete c;
+  return true;
+}
+
+std::shared_ptr<grpc::Channel> RPCClient::GetChannel(const std::string& ep) {
+  auto it = channels_.find(ep);
+  if (it != channels_.end()) {
+    return it->second;
+  }
+
+  auto ch = std::shared_ptr<grpc::Channel>(
+      grpc::CreateChannel(ep, grpc::InsecureChannelCredentials()));
+
+  channels_[ep] = ch;
+  return ch;
+}
+
+}  // namespace detail
+}  // namespace operators
+}  // namespace paddle
diff --git a/paddle/operators/detail/grpc_client.h b/paddle/operators/detail/grpc_client.h
new file mode 100644
index 0000000000000000000000000000000000000000..d27b5ced9ece67f9b9da3b7f87ec231477603580
--- /dev/null
+++ b/paddle/operators/detail/grpc_client.h
@@ -0,0 +1,147 @@
+/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License. */
+
+#pragma once
+
+#include <grpc++/grpc++.h>
+#include <grpc/support/log.h>
+#include <time.h>
+#include <chrono>
+#include <ctime>
+#include <functional>
+#include <iostream>
+#include <map>
+#include <string>
+#include <vector>
+
+#include "paddle/framework/data_type.h"
+#include "paddle/framework/lod_tensor.h"
+#include "paddle/framework/scope.h"
+#include "paddle/framework/selected_rows.h"
+#include "paddle/operators/detail/sendrecvop_utils.h"
+#include "paddle/operators/detail/simple_block_queue.h"
+
+namespace paddle {
+namespace operators {
+namespace detail {
+
+struct VarHandle {
+  std::string ep;
+  const platform::DeviceContext* ctx;
+  const framework::Scope* scope;
+  std::string name;
+
+  std::string String() const {
+    std::ostringstream s;
+    s << "name:[" << name << "] ep:[" << ep << "]";
+    return s.str();
+  }
+};
+
+void ProcGetResponse(const VarHandle& var_h,
+                     const sendrecv::VariableMessage& msg);
+
+class ClientBase {
+ public:
+  explicit ClientBase(std::shared_ptr<grpc::Channel> ch) {
+    stub_ = sendrecv::SendRecvService::NewStub(ch);
+    context_ = NULL;
+  }
+
+  virtual ~ClientBase() {}
+
+  virtual void Prepare(const VarHandle& var_info, int64_t time_out) {
+    context_.reset(new grpc::ClientContext());
+    var_h_ = var_info;
+
+    std::chrono::system_clock::time_point deadline =
+        std::chrono::system_clock::now() + std::chrono::milliseconds(time_out);
+
+    context_->set_deadline(deadline);
+  }
+
+  virtual void Process() = 0;
+
+  std::unique_ptr<sendrecv::SendRecvService::Stub> stub_;
+  std::unique_ptr<grpc::ClientContext> context_;
+  grpc::Status status_;
+  VarHandle var_h_;
+};
+
+typedef std::function<void(const VarHandle&, const sendrecv::VoidMessage&)>
+    RequestSendCallBack;
+
+class SendProcessor : public ClientBase {
+ public:
+  explicit SendProcessor(std::shared_ptr<grpc::Channel> ch) : ClientBase(ch) {}
+
+  virtual ~SendProcessor() {}
+
+  virtual void Process() {
+    if (response_call_back_) {
+      response_call_back_(var_h_, reply_);
+    }
+  }
+
+  sendrecv::VoidMessage reply_;
+  RequestSendCallBack response_call_back_ = NULL;
+};
+
+typedef std::function<void(const VarHandle&, const sendrecv::VariableMessage&)>
+    RequestGetCallBack;
+
+class GetProcessor : public ClientBase {
+ public:
+  explicit GetProcessor(std::shared_ptr<grpc::Channel> ch) : ClientBase(ch) {}
+
+  virtual ~GetProcessor() {}
+
+  virtual void Process() {
+    if (response_call_back_) {
+      response_call_back_(var_h_, reply_);
+    }
+  }
+
+  sendrecv::VariableMessage reply_;
+  RequestGetCallBack response_call_back_ = ProcGetResponse;
+};
+
+class RPCClient {
+ public:
+  bool AsyncSendVariable(const std::string& ep,
+                         const platform::DeviceContext& ctx,
+                         const framework::Scope& scope,
+                         const std::string& var_name,
+                         int64_t time_out = 600 * 1000);
+
+  bool AsyncGetVariable(const std::string& ep,
+                        const platform::DeviceContext& ctx,
+                        const framework::Scope& scope,
+                        const std::string& var_name,
+                        int64_t time_out = 600 * 1000);
+  bool wait();
+
+ private:
+  bool Proceed();
+  std::shared_ptr<grpc::Channel> GetChannel(const std::string& ep);
+
+ private:
+  grpc::CompletionQueue cq_;
+  std::map<std::string, std::shared_ptr<grpc::Channel>> channels_;
+  int64_t req_count_ = 0;
+};
+
+}  // namespace detail
+}  // namespace operators
+}  // namespace paddle
diff --git a/paddle/operators/detail/grpc_server.cc b/paddle/operators/detail/grpc_server.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e8d561a57ff59e9221400241f881cb26fb6c6f06
--- /dev/null
+++ b/paddle/operators/detail/grpc_server.cc
@@ -0,0 +1,237 @@
+/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License. */
+
+#include "paddle/operators/detail/grpc_server.h"
+
+using grpc::ServerAsyncResponseWriter;
+
+namespace paddle {
+namespace operators {
+namespace detail {
+
+enum CallStatus { PROCESS = 0, FINISH };
+
+// reference:
+// https://stackoverflow.com/questions/41732884/grpc-multiple-services-in-cpp-async-server
+class RequestBase {
+ public:
+  explicit RequestBase(sendrecv::SendRecvService::AsyncService* service,
+                       grpc::ServerCompletionQueue* cq)
+      : service_(service), cq_(cq), status_(PROCESS) {}
+  virtual ~RequestBase() {}
+  virtual void Process() { assert(false); }
+
+  CallStatus Status() { return status_; }
+  void SetStatus(CallStatus status) { status_ = status; }
+
+ protected:
+  grpc::ServerContext ctx_;
+  sendrecv::SendRecvService::AsyncService* service_;
+  grpc::ServerCompletionQueue* cq_;
+  CallStatus status_;
+};
+
+typedef std::pair<std::string, sendrecv::VariableMessage> MessageWithName;
+
+class RequestSend final : public RequestBase {
+ public:
+  explicit RequestSend(sendrecv::SendRecvService::AsyncService* service,
+                       grpc::ServerCompletionQueue* cq,
+                       SimpleBlockQueue<MessageWithName>* queue)
+      : RequestBase(service, cq), queue_(queue), responder_(&ctx_) {
+    service_->RequestSendVariable(&ctx_, &request_, &responder_, cq_, cq_,
+                                  this);
+  }
+
+  virtual ~RequestSend() {}
+
+  virtual void Process() {
+    MessageWithName msg_with_name =
+        std::make_pair(request_.varname(), std::move(request_));
+    queue_->Push(std::move(msg_with_name));
+    // TODO(gongwb): check var's info.
+    responder_.Finish(reply_, grpc::Status::OK, this);
+  }
+
+ protected:
+  sendrecv::VariableMessage request_;
+  sendrecv::VoidMessage reply_;
+  SimpleBlockQueue<MessageWithName>* queue_;
+  ServerAsyncResponseWriter<sendrecv::VoidMessage> responder_;
+};
+
+class RequestGet final : public RequestBase {
+ public:
+  explicit RequestGet(sendrecv::SendRecvService::AsyncService* service,
+                      grpc::ServerCompletionQueue* cq, framework::Scope* scope)
+      : RequestBase(service, cq), responder_(&ctx_), scope_(scope) {
+    service_->RequestGetVariable(&ctx_, &request_, &responder_, cq_, cq_, this);
+  }
+
+  virtual ~RequestGet() {}
+
+  virtual void Process() {
+    // proc request.
+    std::string var_name = request_.varname();
+    auto* var = scope_->FindVar(var_name);
+    SerializeToMessage(var_name, var, platform::CPUDeviceContext(), &reply_);
+    // TODO(gongwb): check var's info.
+    responder_.Finish(reply_, grpc::Status::OK, this);
+  }
+
+ protected:
+  sendrecv::VariableMessage request_;
+  sendrecv::VariableMessage reply_;
+  ServerAsyncResponseWriter<sendrecv::VariableMessage> responder_;
+  framework::Scope* scope_;
+};
+
+void AsyncGRPCServer::RunSyncUpdate() {
+  grpc::ServerBuilder builder;
+  builder.AddListeningPort(address_, grpc::InsecureServerCredentials());
+  builder.RegisterService(&service_);
+
+  cq_send_ = builder.AddCompletionQueue();
+  cq_get_ = builder.AddCompletionQueue();
+  server_ = builder.BuildAndStart();
+  LOG(INFO) << "Server listening on " << address_ << std::endl;
+
+  std::function<void()> send_register =
+      std::bind(&AsyncGRPCServer::TryToRegisterNewSendOne, this);
+  std::function<void()> get_register =
+      std::bind(&AsyncGRPCServer::TryToRegisterNewGetOne, this);
+
+  t_send_.reset(
+      new std::thread(std::bind(&AsyncGRPCServer::HandleRequest, this, false,
+                                cq_send_.get(), "cq_send", send_register)));
+
+  t_get_.reset(
+      new std::thread(std::bind(&AsyncGRPCServer::HandleRequest, this, true,
+                                cq_get_.get(), "cq_get", get_register)));
+
+  // wait server
+  server_->Wait();
+  t_send_->join();
+  t_get_->join();
+}
+
+void AsyncGRPCServer::ShutdownQueue() {
+  std::unique_lock<std::mutex> lock(cq_mutex_);
+  cq_send_->Shutdown();
+  cq_get_->Shutdown();
+  is_shut_down_ = true;
+}
+
+// This URL explains why shutdown is complicate:
+// https://stackoverflow.com/questions/35708348/grpc-what-is-the-recommended-way-to-shut-down-an-asynchronous-server-in-c
+void AsyncGRPCServer::ShutDown() {
+  server_->Shutdown();
+  ShutdownQueue();
+}
+
+void AsyncGRPCServer::TryToRegisterNewSendOne() {
+  std::unique_lock<std::mutex> lock(cq_mutex_);
+  if (is_shut_down_) {
+    return;
+  }
+  RequestSend* send =
+      new RequestSend(&service_, cq_send_.get(), &var_recv_queue_);
+  VLOG(4) << "create RequestSend status:" << send->Status();
+}
+
+void AsyncGRPCServer::TryToRegisterNewGetOne() {
+  std::unique_lock<std::mutex> lock(cq_mutex_);
+  if (is_shut_down_) {
+    return;
+  }
+  RequestGet* get = new RequestGet(&service_, cq_get_.get(), scope_);
+  VLOG(4) << "create Requestget status:" << get->Status();
+}
+
+void AsyncGRPCServer::SetFinishOrDelete(RequestBase*& last) {
+  std::unique_lock<std::mutex> lock(cq_mutex_);
+  if (is_shut_down_) {
+    delete last;
+    last = NULL;
+    return;
+  }
+
+  last->SetStatus(FINISH);
+  return;
+}
+
+void AsyncGRPCServer::HandleRequest(bool wait, grpc::ServerCompletionQueue* cq,
+                                    std::string cq_name,
+                                    std::function<void()> TryToRegisterNewOne) {
+  TryToRegisterNewOne();
+
+  void* tag = NULL;
+  bool ok = false;
+  while (true) {
+    if (!cq->Next(&tag, &ok)) {
+      LOG(INFO) << cq_name << " get CompletionQueue shutdown!";
+      break;
+    }
+
+    if (wait && !done_) {
+      Wait();
+    }
+
+    RequestBase* base = (RequestBase*)tag;
+    if (!ok) {
+      VLOG(4) << cq_name << " recv no regular event";
+      TryToRegisterNewOne();
+      delete base;
+      continue;
+    }
+
+    switch (base->Status()) {
+      case PROCESS: {
+        VLOG(4) << cq_name << " status:" << base->Status();
+        TryToRegisterNewOne();
+        base->Process();
+        SetFinishOrDelete(base);
+        break;
+      }
+      case FINISH: {
+        VLOG(4) << cq_name << " status:" << base->Status();
+        delete base;
+        break;
+      }
+      default: { assert(false); }
+    }
+  }
+}
+
+void AsyncGRPCServer::Wait() {
+  std::unique_lock<std::mutex> lock(this->mutex_);
+  condition_.wait(lock, [=] { return this->done_ == true; });
+}
+
+void AsyncGRPCServer::Reset() {
+  std::lock_guard<std::mutex> lock(this->mutex_);
+  done_ = false;
+}
+
+void AsyncGRPCServer::Done() {
+  {
+    std::lock_guard<std::mutex> lock(this->mutex_);
+    done_ = true;
+  }
+  condition_.notify_all();
+}
+
+}  // namespace detail
+}  // namespace operators
+}  // namespace paddle
diff --git a/paddle/operators/detail/grpc_server.h b/paddle/operators/detail/grpc_server.h
new file mode 100644
index 0000000000000000000000000000000000000000..041fe05b2e9c37e8a91669b8f523c47b56e14cba
--- /dev/null
+++ b/paddle/operators/detail/grpc_server.h
@@ -0,0 +1,91 @@
+/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License. */
+
+#pragma once
+
+#include "paddle/framework/lod_tensor.h"
+#include "paddle/framework/scope.h"
+#include "paddle/framework/selected_rows.h"
+#include "paddle/framework/var_type.h"
+#include "paddle/operators/detail/simple_block_queue.h"
+
+#include "paddle/operators/detail/send_recv.grpc.pb.h"
+#include "paddle/operators/detail/send_recv.pb.h"
+
+#include <grpc++/grpc++.h>
+#include <grpc/support/log.h>
+#include <thread>
+#include "paddle/operators/detail/sendrecvop_utils.h"
+
+namespace paddle {
+namespace operators {
+namespace detail {
+
+typedef std::pair<std::string, sendrecv::VariableMessage> MessageWithName;
+class RequestBase;
+
+class AsyncGRPCServer final : public sendrecv::SendRecvService::Service {
+ public:
+  explicit AsyncGRPCServer(std::string address) { address_ = address; }
+
+  void RunSyncUpdate();
+
+  void Reset();
+
+  void Done();
+
+  void SetScope(framework::Scope *scope) { scope_ = scope; }
+
+  const MessageWithName Get() { return this->var_recv_queue_.Pop(); }
+
+  void Push(const MessageWithName &msg) { this->var_recv_queue_.Push(msg); }
+
+  void ShutDown();
+
+ protected:
+  void Wait();
+  void HandleRequest(bool wait, grpc::ServerCompletionQueue *cq,
+                     std::string cq_name,
+                     std::function<void()> TryToRegisterNewOne);
+  void TryToRegisterNewSendOne();
+  void TryToRegisterNewGetOne();
+  void SetFinishOrDelete(RequestBase *&last);
+  void ShutdownQueue();
+
+ private:
+  std::mutex cq_mutex_;
+  volatile bool is_shut_down_ = false;
+  std::unique_ptr<grpc::ServerCompletionQueue> cq_send_;
+  std::unique_ptr<grpc::ServerCompletionQueue> cq_get_;
+
+  sendrecv::SendRecvService::AsyncService service_;
+  std::unique_ptr<grpc::Server> server_;
+
+  std::string address_;
+  framework::Scope *scope_;
+  // received variable from RPC, operators fetch variable from this queue.
+  SimpleBlockQueue<MessageWithName> var_recv_queue_;
+
+  // condition of the sub program
+  std::mutex mutex_;
+  volatile mutable bool done_;
+  std::condition_variable condition_;
+
+  std::unique_ptr<std::thread> t_send_;
+  std::unique_ptr<std::thread> t_get_;
+};
+
+};  // namespace detail
+};  // namespace operators
+};  // namespace paddle
diff --git a/paddle/operators/detail/recv_impl.cc b/paddle/operators/detail/recv_impl.cc
deleted file mode 100644
index 319404e56a5f3c407f313991240bbbb85fd39a2a..0000000000000000000000000000000000000000
--- a/paddle/operators/detail/recv_impl.cc
+++ /dev/null
@@ -1,65 +0,0 @@
-/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License. */
-
-#include "send_recv_impl.h"
-
-namespace paddle {
-namespace operators {
-namespace detail {
-
-Status SendRecvServerImpl::SendVariable(ServerContext *context,
-                                        const VariableMessage *in_var,
-                                        VoidMessage *out_var) {
-  MessageWithName msg_with_name =
-      std::make_pair(in_var->varname(), std::move(*in_var));
-  var_recv_queue_.Push(std::move(msg_with_name));
-  return Status::OK;
-}
-
-Status SendRecvServerImpl::GetVariable(ServerContext *context,
-                                       const VariableMessage *in_var,
-                                       VariableMessage *out_var) {
-  std::string get_var_name = in_var->varname();
-  auto *var = scope_->FindVar(get_var_name);
-
-  SerializeToMessage(get_var_name, var, platform::CPUDeviceContext(), out_var);
-  return Status::OK;
-}
-
-Status SendRecvServerImpl::Wait(ServerContext *context,
-                                const VoidMessage *in_var,
-                                VoidMessage *out_var) {
-  {
-    std::unique_lock<std::mutex> lock(this->mutex_);
-    condition_.wait(lock, [=] { return this->done_ == true; });
-  }
-  return Status::OK;
-}
-
-void SendRecvServerImpl::Reset() {
-  std::lock_guard<std::mutex> lock(this->mutex_);
-  done_ = false;
-}
-
-void SendRecvServerImpl::Done() {
-  {
-    std::lock_guard<std::mutex> lock(this->mutex_);
-    done_ = true;
-  }
-  condition_.notify_all();
-}
-
-}  // namespace detail
-}  // namespace operators
-}  // namespace paddle
diff --git a/paddle/operators/detail/send_impl.cc b/paddle/operators/detail/send_impl.cc
deleted file mode 100644
index ae85cf2cec2cd8e046c0c7fd3408f2212f225819..0000000000000000000000000000000000000000
--- a/paddle/operators/detail/send_impl.cc
+++ /dev/null
@@ -1,67 +0,0 @@
-/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License. */
-
-#include "send_recv_impl.h"
-
-namespace paddle {
-namespace operators {
-namespace detail {
-
-bool RPCClient::SendVariable(const framework::Scope& scope,
-                             const std::string& inname) {
-  ClientContext context;
-  VariableMessage msg;
-  VoidMessage out_msg;
-  // FIXME(typhoonzero): pass device context to here.
-  auto ctx = platform::CPUDeviceContext();
-  auto* var = scope.FindVar(inname);
-  PADDLE_ENFORCE(var);
-  SerializeToMessage(inname, var, ctx, &msg);
-
-  Status status = stub_->SendVariable(&context, msg, &out_msg);
-  if (!status.ok()) {
-    LOG(ERROR) << "gRPC error: " << status.error_message();
-    return false;
-  }
-  return true;
-}
-
-bool RPCClient::GetVariable(const framework::Scope& scope,
-                            const std::string& outname) {
-  ClientContext context;
-  VariableMessage call_msg, ret_msg;
-  call_msg.set_varname(outname);
-  auto ctx = platform::CPUDeviceContext();
-  Status status = stub_->GetVariable(&context, call_msg, &ret_msg);
-  auto* outvar = scope.FindVar(outname);
-  if (!status.ok()) {
-    LOG(ERROR) << "gRPC error: " << status.error_message();
-    return false;
-  }
-
-  std::istringstream iss(ret_msg.serialized());
-  DeserializeFromMessage(ret_msg, ctx, outvar);
-
-  return true;
-}
-
-void RPCClient::Wait() {
-  ClientContext context;
-  VoidMessage call_msg, ret_msg;
-  stub_->Wait(&context, call_msg, &ret_msg);
-}
-
-}  // namespace detail
-}  // namespace operators
-}  // namespace paddle
diff --git a/paddle/operators/detail/send_recv.proto b/paddle/operators/detail/send_recv.proto
index f141c755ce14ef540aeab32c11c289179aff3f8c..8f962b4c69cc83dc2ab98b7dc27e18bc4b42bf18 100644
--- a/paddle/operators/detail/send_recv.proto
+++ b/paddle/operators/detail/send_recv.proto
@@ -21,8 +21,6 @@ service SendRecvService {
   rpc SendVariable(VariableMessage) returns (VoidMessage) {}
   // Argument VariableMessage for GetVariable should only contain varname.
   rpc GetVariable(VariableMessage) returns (VariableMessage) {}
-  // wait for one execution of the program
-  rpc Wait(VoidMessage) returns (VoidMessage) {}
 }
 
 // VariableMessage is serialized paddle variable message.
diff --git a/paddle/operators/detail/send_recv_impl.h b/paddle/operators/detail/send_recv_impl.h
deleted file mode 100644
index 1fe54f1f0536aed7d41bbdeeca076534abafe98d..0000000000000000000000000000000000000000
--- a/paddle/operators/detail/send_recv_impl.h
+++ /dev/null
@@ -1,141 +0,0 @@
-/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License. */
-
-#pragma once
-
-#include "paddle/framework/lod_tensor.h"
-#include "paddle/framework/scope.h"
-#include "paddle/framework/selected_rows.h"
-#include "paddle/framework/var_type.h"
-#include "paddle/operators/detail/simple_block_queue.h"
-
-#include "paddle/operators/detail/send_recv.grpc.pb.h"
-#include "paddle/operators/detail/send_recv.pb.h"
-
-#include <grpc++/grpc++.h>
-
-using grpc::Channel;
-using grpc::Server;
-using grpc::ServerContext;
-using grpc::ServerReader;
-using grpc::ServerBuilder;
-
-using grpc::ClientContext;
-using grpc::ClientReader;
-using grpc::ClientReaderWriter;
-using grpc::ClientWriter;
-using grpc::Status;
-using sendrecv::SendRecvService;
-using sendrecv::VariableMessage;
-using sendrecv::VoidMessage;
-
-namespace paddle {
-namespace operators {
-namespace detail {
-
-typedef std::pair<std::string, sendrecv::VariableMessage> MessageWithName;
-
-class SendRecvServerImpl final : public SendRecvService::Service {
- public:
-  explicit SendRecvServerImpl() {}
-
-  Status SendVariable(ServerContext *context, const VariableMessage *in_var,
-                      VoidMessage *out_var) override;
-  Status GetVariable(ServerContext *context, const VariableMessage *in_var,
-                     VariableMessage *out_var) override;
-  Status Wait(ServerContext *context, const VoidMessage *in_var,
-              VoidMessage *out_var) override;
-  void Reset();
-  void Done();
-  void SetScope(framework::Scope *scope) { scope_ = scope; };
-
-  const MessageWithName Get() { return this->var_recv_queue_.Pop(); }
-
-  void Push(const MessageWithName &msg) { this->var_recv_queue_.Push(msg); }
-
- private:
-  // received variable from RPC, operators fetch variable from this queue.
-  SimpleBlockQueue<MessageWithName> var_recv_queue_;
-  framework::Scope *scope_;
-  // condition of the sub program
-  std::mutex mutex_;
-  bool done_;
-  std::condition_variable condition_;
-};
-
-// RPCClient is a class to send tensors to pserver sub-network
-// using different hashing methods.
-class RPCClient {
- public:
-  RPCClient(std::shared_ptr<Channel> channel)
-      : stub_(SendRecvService::NewStub(channel)) {}
-
-  bool SendVariable(const framework::Scope &scope, const std::string &inname);
-  bool GetVariable(const framework::Scope &scope, const std::string &outname);
-  void Wait();
-
- private:
-  std::unique_ptr<SendRecvService::Stub> stub_;
-};
-
-inline void SerializeToMessage(const std::string &name,
-                               const framework::Variable *var,
-                               const platform::DeviceContext &ctx,
-                               VariableMessage *msg) {
-  msg->set_varname(name);
-  std::ostringstream oss;
-  switch (framework::ToVarType(var->Type())) {
-    case framework::proto::VarDesc_VarType_LOD_TENSOR:
-      msg->set_type(sendrecv::VarType::LOD_TENSOR);
-      framework::SerializeToStream(oss, var->Get<framework::LoDTensor>(), ctx);
-      break;
-    case framework::proto::VarDesc_VarType_SELECTED_ROWS:
-      msg->set_type(sendrecv::VarType::SELECTED_ROWS);
-      framework::SerializeToStream(oss, var->Get<framework::SelectedRows>(),
-                                   ctx);
-      break;
-    default: {
-      PADDLE_THROW("Serialize does not support type: %s",
-                   typeid(var->Type()).name());
-      break;
-    }
-  }
-  msg->set_serialized(oss.str());
-}
-
-inline void DeserializeFromMessage(const VariableMessage &msg,
-                                   const platform::DeviceContext &ctx,
-                                   framework::Variable *var) {
-  using namespace paddle::framework::proto;
-  std::istringstream iss(msg.serialized());
-  switch (msg.type()) {
-    case sendrecv::VarType::LOD_TENSOR:
-      DeserializeFromStream(iss, var->GetMutable<framework::LoDTensor>(), ctx);
-      break;
-    case sendrecv::VarType::SELECTED_ROWS: {
-      DeserializeFromStream(iss, var->GetMutable<framework::SelectedRows>(),
-                            ctx);
-      break;
-    }
-    default: {
-      PADDLE_THROW("Deserialize does not support type: %s",
-                   typeid(var->Type()).name());
-      break;
-    }
-  }
-}
-
-}  // namespace detail
-}  // namespace operators
-}  // namespace paddle
diff --git a/paddle/operators/detail/sendrecvop_utils.cc b/paddle/operators/detail/sendrecvop_utils.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7635b9e8dbdff624bb42a9de346b8d05a980f9b6
--- /dev/null
+++ b/paddle/operators/detail/sendrecvop_utils.cc
@@ -0,0 +1,68 @@
+/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License. */
+
+#include "paddle/operators/detail/sendrecvop_utils.h"
+
+namespace paddle {
+namespace operators {
+namespace detail {
+
+void SerializeToMessage(const std::string& name, const framework::Variable* var,
+                        const platform::DeviceContext& ctx,
+                        sendrecv::VariableMessage* msg) {
+  msg->set_varname(name);
+  std::ostringstream oss;
+  switch (framework::ToVarType(var->Type())) {
+    case framework::proto::VarDesc_VarType_LOD_TENSOR:
+      msg->set_type(sendrecv::VarType::LOD_TENSOR);
+      framework::SerializeToStream(oss, var->Get<framework::LoDTensor>(), ctx);
+      break;
+    case framework::proto::VarDesc_VarType_SELECTED_ROWS:
+      msg->set_type(sendrecv::VarType::SELECTED_ROWS);
+      framework::SerializeToStream(oss, var->Get<framework::SelectedRows>(),
+                                   ctx);
+      break;
+    default: {
+      PADDLE_THROW("Serialize does not support type: %s",
+                   typeid(var->Type()).name());
+      break;
+    }
+  }
+  msg->set_serialized(oss.str());
+}
+
+void DeserializeFromMessage(const sendrecv::VariableMessage& msg,
+                            const platform::DeviceContext& ctx,
+                            framework::Variable* var) {
+  std::istringstream iss(msg.serialized());
+  switch (msg.type()) {
+    case sendrecv::VarType::LOD_TENSOR:
+      DeserializeFromStream(iss, var->GetMutable<framework::LoDTensor>(), ctx);
+      break;
+    case sendrecv::VarType::SELECTED_ROWS: {
+      DeserializeFromStream(iss, var->GetMutable<framework::SelectedRows>(),
+                            ctx);
+      break;
+    }
+    default: {
+      PADDLE_THROW("Deserialize does not support type: %s",
+                   typeid(var->Type()).name());
+      break;
+    }
+  }
+}
+
+}  // namespace detail
+}  // namespace operators
+}  // namespace paddle
diff --git a/paddle/operators/detail/sendrecvop_utils.h b/paddle/operators/detail/sendrecvop_utils.h
new file mode 100644
index 0000000000000000000000000000000000000000..bc6581afab93c626c7c2439d699c6c2d858df9fa
--- /dev/null
+++ b/paddle/operators/detail/sendrecvop_utils.h
@@ -0,0 +1,42 @@
+/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License. */
+
+#pragma once
+#include <iostream>
+#include <string>
+#include <vector>
+
+#include "paddle/framework/data_type.h"
+#include "paddle/framework/lod_tensor.h"
+#include "paddle/framework/scope.h"
+#include "paddle/framework/selected_rows.h"
+#include "paddle/framework/var_type.h"
+
+#include "paddle/operators/detail/send_recv.grpc.pb.h"
+#include "paddle/operators/detail/send_recv.pb.h"
+
+namespace paddle {
+namespace operators {
+namespace detail {
+
+void SerializeToMessage(const std::string& name, const framework::Variable* var,
+                        const platform::DeviceContext& ctx,
+                        sendrecv::VariableMessage* msg);
+
+void DeserializeFromMessage(const sendrecv::VariableMessage& msg,
+                            const platform::DeviceContext& ctx,
+                            framework::Variable* var);
+}  // namespace detail
+}  // namespace operators
+}  // namespace paddle
diff --git a/paddle/operators/recv_op.cc b/paddle/operators/recv_op.cc
index 9331c7b563491902b2824898766cacb9bfdee2d9..55b33343af43802e1b6b95a32603bfee806c9764 100644
--- a/paddle/operators/recv_op.cc
+++ b/paddle/operators/recv_op.cc
@@ -24,7 +24,8 @@ limitations under the License. */
 #include "paddle/framework/lod_tensor.h"
 #include "paddle/framework/op_registry.h"
 #include "paddle/framework/proto_desc.h"
-#include "paddle/operators/detail/send_recv_impl.h"
+#include "paddle/operators/detail/grpc_server.h"
+#include "paddle/operators/detail/sendrecvop_utils.h"
 #include "paddle/operators/detail/simple_block_queue.h"
 
 #define LISTEN_TERMINATE_MESSAGE "TERMINATE@RECV"
@@ -32,6 +33,11 @@ limitations under the License. */
 namespace paddle {
 namespace operators {
 
+void RunServer(std::shared_ptr<detail::AsyncGRPCServer> service) {
+  service->RunSyncUpdate();
+  VLOG(4) << "RunServer thread end";
+}
+
 static void CreateTensorFromMessageType(framework::Variable *var,
                                         sendrecv::VarType var_type) {
   if (var_type == sendrecv::VarType::LOD_TENSOR) {
@@ -46,18 +52,6 @@ static void CreateTensorFromMessageType(framework::Variable *var,
   }
 }
 
-void RunServer(Server **rpc_server,
-               std::shared_ptr<detail::SendRecvServerImpl> service,
-               const std::string &server_address) {
-  ServerBuilder builder;
-  builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
-  builder.RegisterService(service.get());
-  std::unique_ptr<Server> server(builder.BuildAndStart());
-  *rpc_server = server.get();
-  LOG(INFO) << "Server listening on " << server_address;
-  server->Wait();
-}
-
 class RecvOp : public framework::OperatorBase {
  public:
   RecvOp(const std::string &type, const framework::VariableNameMap &inputs,
@@ -65,10 +59,9 @@ class RecvOp : public framework::OperatorBase {
          const framework::AttributeMap &attrs)
       : OperatorBase(type, inputs, outputs, attrs) {
     if (!rpc_service_) {
-      rpc_service_.reset(new detail::SendRecvServerImpl());
       std::string endpoint = Attr<std::string>("endpoint");
-      server_thread_.reset(
-          new std::thread(RunServer, &rpc_server_, rpc_service_, endpoint));
+      rpc_service_.reset(new detail::AsyncGRPCServer(endpoint));
+      server_thread_.reset(new std::thread(RunServer, rpc_service_));
     }
   }
 
@@ -76,7 +69,7 @@ class RecvOp : public framework::OperatorBase {
     detail::MessageWithName term_msg;
     term_msg.first = LISTEN_TERMINATE_MESSAGE;
     rpc_service_->Push(term_msg);
-    rpc_server_->Shutdown();
+    rpc_service_->ShutDown();
     server_thread_->join();
   }
 
@@ -99,10 +92,12 @@ class RecvOp : public framework::OperatorBase {
     auto grad_list = Attr<std::vector<std::string>>("GradList");
     auto trainer_count = Attr<int>("Trainers");
     size_t param_count = param_list.size();
+
     rpc_service_->Reset();
     // TODO(typhoonzero): change this to a while_op for every cluster-batch.
     bool exit_flag = false;
     while (!exit_flag) {
+      // TODO(gognwb): simply this loop.
       // Get from multiple trainers, we don't care about order in which
       // the gradient arrives, just add suffix 0~n then average the gradient.
       for (size_t i = 0; i < param_count * trainer_count; ++i) {
@@ -110,6 +105,7 @@ class RecvOp : public framework::OperatorBase {
         const detail::MessageWithName &v = rpc_service_->Get();
         auto grad_var_name = v.first;
         if (grad_var_name == LISTEN_TERMINATE_MESSAGE) {
+          VLOG(4) << "received LISTEN_TERMINATE_MESSAGE and RunOp.Run() exit";
           exit_flag = true;
           break;
         }
@@ -118,10 +114,12 @@ class RecvOp : public framework::OperatorBase {
         if (it != grad_list.end()) {
           param_var_name = param_list[it - grad_list.begin()];
         } else {
-          LOG(ERROR) << "grad have no paired param found!";
+          LOG(ERROR) << "grad have no paired param found!\"" << grad_var_name
+                     << "\"";
         }
         VLOG(3) << "recved grad: " << grad_var_name
                 << " updating param: " << param_var_name;
+
         auto *merged_grad = recv_scope.FindVar(grad_var_name);
         if (merged_grad == nullptr) {
           auto *ptr = recv_scope.Var(grad_var_name);
@@ -141,9 +139,11 @@ class RecvOp : public framework::OperatorBase {
         auto &dev_ctx = *pool.Get(dev_place);
         detail::DeserializeFromMessage(v.second, dev_ctx, var);
       }
+
       if (exit_flag) {
         break;
       }
+
       rpc_service_->Reset();
 
       std::string program_str = Attr<std::string>("OptimizeProgram");
@@ -158,17 +158,14 @@ class RecvOp : public framework::OperatorBase {
       } catch (std::exception &e) {
         LOG(ERROR) << "run sub program error " << e.what();
       }
+
       rpc_service_->Done();
       grads_counter_.clear();
     }  // while(true)
   }
 
  protected:
-  // grpc server instance to track status and gracefully shutdown.
-  // borrow an pointer from server thread.
-  Server *rpc_server_{nullptr};
-  // grpc send/recv service implement to register.
-  std::shared_ptr<detail::SendRecvServerImpl> rpc_service_;
+  std::shared_ptr<detail::AsyncGRPCServer> rpc_service_;
   std::shared_ptr<std::thread> server_thread_;
   mutable std::unordered_map<std::string, int> grads_counter_;
 };
diff --git a/paddle/operators/send_op.cc b/paddle/operators/send_op.cc
index 95c207221a7b34732eca4cfd07fed0a8f1671981..4d145250bdc73607c8817e20fdb753f4c96e2391 100644
--- a/paddle/operators/send_op.cc
+++ b/paddle/operators/send_op.cc
@@ -19,59 +19,45 @@ limitations under the License. */
 #include "paddle/framework/lod_tensor.h"
 #include "paddle/framework/op_registry.h"
 
-#include "paddle/operators/detail/send_recv_impl.h"
-#include "paddle/operators/detail/simple_block_queue.h"
+#include <future>
+#include "paddle/operators/detail/grpc_client.h"
 
 namespace paddle {
 namespace operators {
 
-// TODO(typhoonzero): this is a simple implementation which only send
-// one tensor
 class SendOp : public framework::OperatorBase {
  public:
-  SendOp(const std::string &type, const framework::VariableNameMap &inputs,
-         const framework::VariableNameMap &outputs,
-         const framework::AttributeMap &attrs)
-      : OperatorBase(type, inputs, outputs, attrs) {
-    // init client when the operator is created at runtime.
-    std::vector<std::string> endpoints =
-        Attr<std::vector<std::string>>("endpoints");
-    for (auto ep : endpoints) {
-      client_map_[ep].reset(new detail::RPCClient(
-          grpc::CreateChannel(ep, grpc::InsecureChannelCredentials())));
-    }
-  }
+  SendOp(const std::string& type, const framework::VariableNameMap& inputs,
+         const framework::VariableNameMap& outputs,
+         const framework::AttributeMap& attrs)
+      : OperatorBase(type, inputs, outputs, attrs) {}
 
-  void Run(const framework::Scope &scope,
-           const platform::Place &dev_place) const override {
+  void Run(const framework::Scope& scope,
+           const platform::Place& dev_place) const override {
     auto ins = Inputs("X");
     auto outs = Outputs("Out");
     std::vector<std::string> epmap = Attr<std::vector<std::string>>("epmap");
-    // TODO(typhoonzero): use async calls to send multiple variable asyncly.
-    for (size_t i = 0; i < ins.size(); ++i) {
-      bool ret = client_map_[epmap[i]]->SendVariable(scope, ins[i]);
-      if (!ret) {
-        LOG(ERROR) << "send variable error: " << ins[i];
-      }
+
+    // FIXME(gongwb): DeviceContext?
+    auto ctx = platform::CPUDeviceContext();
+    for (size_t i = 0; i < ins.size(); i++) {
+      client_.AsyncSendVariable(epmap[i], ctx, scope, ins[i]);
     }
-    // TODO(typhoonzero): support async optimization
-    client_map_[epmap[0]]->Wait();
-    for (size_t i = 0; i < outs.size(); ++i) {
-      bool ret = client_map_[epmap[i]]->GetVariable(scope, outs[i]);
-      if (!ret) {
-        LOG(ERROR) << "GetVariable error: " << outs[i];
-      }
+
+    for (size_t i = 0; i < outs.size(); i++) {
+      client_.AsyncGetVariable(epmap[i], ctx, scope, outs[i]);
     }
+
+    client_.wait();
   }
 
- protected:
-  mutable std::unordered_map<std::string, std::shared_ptr<detail::RPCClient>>
-      client_map_;
+ private:
+  mutable detail::RPCClient client_;
 };
 
 class SendOpMaker : public framework::OpProtoAndCheckerMaker {
  public:
-  SendOpMaker(OpProto *proto, OpAttrChecker *op_checker)
+  SendOpMaker(OpProto* proto, OpAttrChecker* op_checker)
       : OpProtoAndCheckerMaker(proto, op_checker) {
     AddInput("X", "(Tensor) Input tensor to be send").AsDuplicable();
     AddOutput("Out", "(Tensor) Output tensor to get from server")
diff --git a/paddle/operators/send_recv_op_test.cc b/paddle/operators/send_recv_op_test.cc
index fa94424bf9e8e719ec0822268685b0806a109d21..ea091694798475dfd9631910a750405be950c20c 100644
--- a/paddle/operators/send_recv_op_test.cc
+++ b/paddle/operators/send_recv_op_test.cc
@@ -140,7 +140,7 @@ void StartServerNet(bool is_sparse) {
 
 TEST(SendRecvOp, CPUDense) {
   std::thread server_thread(StartServerNet, false);
-  sleep(3);  // wait server to start
+  sleep(10);  // wait server to start
   // local net
   f::Scope scope;
   p::CPUPlace place;