diff --git a/python/paddle_serving_server/__init__.py b/python/paddle_serving_server/__init__.py
index 3a5c07011ace961fdfb61ebf3217ab1aab375e82..2d28e92d85faab4b96cf6cc934eb6563d31ab155 100644
--- a/python/paddle_serving_server/__init__.py
+++ b/python/paddle_serving_server/__init__.py
@@ -231,6 +231,7 @@ class Server(object):
             self.infer_service_conf.services.extend([infer_service])
 
     def _prepare_resource(self, workdir):
+        self.workdir = workdir
         if self.resource_conf == None:
             with open("{}/{}".format(workdir, self.general_model_config_fn),
                       "w") as fout:
@@ -328,10 +329,10 @@ class Server(object):
         os.chdir(self.module_path)
         need_download = False
         device_version = self.get_device_version()
-        floder_name = device_version + serving_server_version
-        tar_name = floder_name + ".tar.gz"
+        folder_name = device_version + serving_server_version
+        tar_name = folder_name + ".tar.gz"
         bin_url = "https://paddle-serving.bj.bcebos.com/bin/" + tar_name
-        self.server_path = os.path.join(self.module_path, floder_name)
+        self.server_path = os.path.join(self.module_path, folder_name)
 
         #acquire lock
         version_file = open("{}/version.py".format(self.module_path), "r")
@@ -357,7 +358,7 @@ class Server(object):
                         os.remove(exe_path)
                     raise SystemExit(
                         'Decompressing failed, please check your permission of {} or disk space left.'.
-                        foemat(self.module_path))
+                        format(self.module_path))
                 finally:
                     os.remove(tar_name)
         #release lock
@@ -375,10 +376,10 @@ class Server(object):
 
         if not self.port_is_available(port):
             raise SystemExit("Prot {} is already used".format(port))
+        self.set_port(port)
         self._prepare_resource(workdir)
         self._prepare_engine(self.model_config_paths, device)
         self._prepare_infer_service(port)
-        self.port = port
         self.workdir = workdir
 
         infer_service_fn = "{}/{}".format(workdir, self.infer_service_fn)
diff --git a/python/paddle_serving_server/web_service.py b/python/paddle_serving_server/web_service.py
index b3fcc1b880fcbffa1da884e4b68350c1870997c1..8f859c2cebc836d50edb7904f31b4bd4f7e8d98f 100755
--- a/python/paddle_serving_server/web_service.py
+++ b/python/paddle_serving_server/web_service.py
@@ -85,9 +85,9 @@ class WebService(object):
             fetch_map = self.client.predict(feed=feed, fetch=fetch)
             for key in fetch_map:
                 fetch_map[key] = fetch_map[key].tolist()
-            fetch_map = self.postprocess(
+            result = self.postprocess(
                 feed=request.json["feed"], fetch=fetch, fetch_map=fetch_map)
-            result = {"result": fetch_map}
+            result = {"result": result}
         except ValueError:
             result = {"result": "Request Value Error"}
         return result
@@ -122,7 +122,7 @@ class WebService(object):
                               processes=1)
 
     def get_app_instance(self):
-        return self.app_instance
+        return app_instance
 
     def preprocess(self, feed=[], fetch=[]):
         return feed, fetch
diff --git a/python/paddle_serving_server_gpu/web_service.py b/python/paddle_serving_server_gpu/web_service.py
index 76721de8a005dfb23fbe2427671446889aa72af1..4c887f0e3048031b97eb0deda0662adeaddeb559 100644
--- a/python/paddle_serving_server_gpu/web_service.py
+++ b/python/paddle_serving_server_gpu/web_service.py
@@ -50,12 +50,12 @@ class WebService(object):
         general_infer_op = op_maker.create('general_infer')
         general_response_op = op_maker.create('general_response')
 
-        op_seq_maker = serving.OpSeqMaker()
+        op_seq_maker = OpSeqMaker()
         op_seq_maker.add_op(read_op)
         op_seq_maker.add_op(general_infer_op)
         op_seq_maker.add_op(general_response_op)
 
-        server = serving.Server()
+        server = Server()
         server.set_op_sequence(op_seq_maker.get_op_sequence())
         server.set_num_threads(thread_num)