diff --git a/python/examples/imdb/test_py_server.py b/python/examples/imdb/test_py_server.py
index e3ea39154650e237120bd73045448f9c7f46677a..31d34e19febdae14b9a9c38c0d087e75f8e6843b 100644
--- a/python/examples/imdb/test_py_server.py
+++ b/python/examples/imdb/test_py_server.py
@@ -57,4 +57,5 @@ pyserver.add_cnannel(combine_out_channel)
 pyserver.add_op(cnn_op)
 pyserver.add_op(bow_op)
 pyserver.add_op(combine_op)
+pyserver.prepare_server(port=8080, worker_num=4)
 pyserver.run_server()
diff --git a/python/paddle_serving_server/pserving.py b/python/paddle_serving_server/pserving.py
index 6d8112deb27efa5f8f2cf7cb96a9d122adf2236d..9102b0a09d32282c5bcf78a86e50db9b8a8e8dd1 100644
--- a/python/paddle_serving_server/pserving.py
+++ b/python/paddle_serving_server/pserving.py
@@ -18,6 +18,7 @@ import queue
 import os
 import paddle_serving_server
 from paddle_serving_client import Client
+from concurrent import futures
 import grpc
 import general_python_service_pb2
 import general_python_service_pb2_grpc
@@ -82,11 +83,20 @@ class Op(object):
         self._client.connect([server_name])
         self._fetch_names = fetch_names
 
+    def with_serving(self):
+        return self._client is not None
+
+    def get_inputs(self):
+        return self._inputs
+
     def set_inputs(self, channels):
         if not isinstance(channels, list):
             raise TypeError('channels must be list type')
         self._inputs = channels
 
+    def get_outputs(self):
+        return self._outputs
+
     def set_outputs(self, channels):
         if not isinstance(channels, list):
             raise TypeError('channels must be list type')
@@ -114,7 +124,7 @@ class Op(object):
                 input_data.append(channel.front())
             data = self.preprocess(input_data)
 
-            if self._client is not None:
+            if self.with_serving():
                 fetch_map = self.midprocess(data)
                 output_data = self.postprocess(fetch_map)
             else:
@@ -124,11 +134,25 @@ class Op(object):
                 channel.push(output_data)
 
 
+class GeneralPythonService(
+        general_python_service_pb2_grpc.GeneralPythonService):
+    def __init__(self, channel):
+        self._channel = channel
+
+    def Request(self, request, context):
+        pass
+
+    def Response(self, request, context):
+        pass
+
+
 class PyServer(object):
     def __init__(self):
         self._channels = []
         self._ops = []
         self._op_threads = []
+        self._port = None
+        self._worker_num = None
 
     def add_channel(self, channel):
         self._channels.append(channel)
@@ -139,16 +163,42 @@ class PyServer(object):
     def gen_desc(self):
         pass
 
+    def prepare_server(self, port, worker_num):
+        self._port = port
+        self._worker_num = worker_num
+        self.gen_desc()
+
     def run_server(self):
+        inputs = []
+        outputs = []
         for op in self._ops:
-            self.prepare_server(op)
+            inputs += op.get_inputs()
+            outputs += op.get_outputs()
+            if op.with_serving():
+                self.prepare_serving(op)
             th = multiprocessing.Process(target=op.start, args=(op, ))
             th.start()
             self._op_threads.append(th)
-        for th in self._op_threads:
-            th.join()
 
-    def prepare_server(self, op):
+        input_channel = []
+        for channel in inputs:
+            if channel not in outputs:
+                input_channel.append(channel)
+        if len(input_channel) != 1:
+            raise Exception("input_channel more than 1 or no input_channel")
+
+        server = grpc.server(
+            futures.ThreadPoolExecutor(max_workers=self._worker_num))
+        general_python_service_pb2_grpc.add_GeneralPythonService_to_server(
+            GeneralPythonService(input_channel[0]), server)
+        server.start()
+        try:
+            for th in self._op_threads:
+                th.join()
+        except KeyboardInterrupt:
+            server.stop(0)
+
+    def prepare_serving(self, op):
         model_path = op._server_model
         port = op._server_port
         device = op._device