diff --git a/python/paddle_serving_server/web_service.py b/python/paddle_serving_server/web_service.py
index 1f035db9262ffbd8e031c9b0018877eb2ba6fad2..fbe48180867faf9f2baba71fc3c5c8cf6ab771e2 100644
--- a/python/paddle_serving_server/web_service.py
+++ b/python/paddle_serving_server/web_service.py
@@ -20,7 +20,7 @@ from paddle_serving_server import OpMaker, OpSeqMaker, Server
 from paddle_serving_client import Client
 from contextlib import closing
 import socket
-
+import numpy as np
 from paddle_serving_server import pipeline
 from paddle_serving_server.pipeline import Op
 
@@ -64,8 +64,8 @@ class WebService(object):
         f = open(client_config, 'r')
         model_conf = google.protobuf.text_format.Merge(
             str(f.read()), model_conf)
-        self.feed_names = [var.alias_name for var in model_conf.feed_var]
-        self.fetch_names = [var.alias_name for var in model_conf.fetch_var]
+        self.feed_vars = {var.name: var for var in model_conf.feed_var}
+        self.fetch_vars = {var.name: var for var in model_conf.fetch_var}
 
     def _launch_rpc_service(self):
         op_maker = OpMaker()
@@ -201,6 +201,15 @@ class WebService(object):
     def preprocess(self, feed=[], fetch=[]):
         print("This API will be deprecated later. Please do not use it")
         is_batch = True
+        feed_dict = {}
+        for var_name in self.feed_vars.keys():
+            feed_dict[var_name] = []
+        for feed_ins in feed:
+            for key in feed_ins:
+                feed_dict[key].append(np.array(feed_ins[key]).reshape(list(self.feed_vars[key].shape))[np.newaxis,:])
+        feed = {}
+        for key in feed_dict:
+            feed[key] = np.concatenate(feed_dict[key], axis=0) 
         return feed, fetch, is_batch
 
     def postprocess(self, feed=[], fetch=[], fetch_map=None):
diff --git a/python/paddle_serving_server_gpu/web_service.py b/python/paddle_serving_server_gpu/web_service.py
index 4b89d90ee6893c3fafd596dc8f6c5cabc3a248bf..6e7fc2c148dab721e74a7d1719c48849bbab3405 100644
--- a/python/paddle_serving_server_gpu/web_service.py
+++ b/python/paddle_serving_server_gpu/web_service.py
@@ -70,8 +70,8 @@ class WebService(object):
         f = open(client_config, 'r')
         model_conf = google.protobuf.text_format.Merge(
             str(f.read()), model_conf)
-        self.feed_names = [var.alias_name for var in model_conf.feed_var]
-        self.fetch_names = [var.alias_name for var in model_conf.fetch_var]
+        self.feed_vars = {var.name: var for var in model_conf.feed_var}
+        self.fetch_vars = {var.name: var for var in model_conf.fetch_var}
 
     def set_gpus(self, gpus):
         print("This API will be deprecated later. Please do not use it")
@@ -278,6 +278,15 @@ class WebService(object):
     def preprocess(self, feed=[], fetch=[]):
         print("This API will be deprecated later. Please do not use it")
         is_batch = True
+        feed_dict = {}
+        for var_name in self.feed_vars.keys():
+            feed_dict[var_name] = []
+        for feed_ins in feed:
+            for key in feed_ins:
+                feed_dict[key].append(np.array(feed_ins[key]).reshape(list(self.feed_vars[key].shape))[np.newaxis,:])
+        feed = {}
+        for key in feed_dict:
+            feed[key] = np.concatenate(feed_dict[key], axis=0)
         return feed, fetch, is_batch
 
     def postprocess(self, feed=[], fetch=[], fetch_map=None):