diff --git a/vnpy/rpc/test_client.py b/vnpy/rpc/test_client.py
index 17f42558..7a693a52 100644
--- a/vnpy/rpc/test_client.py
+++ b/vnpy/rpc/test_client.py
@@ -2,13 +2,14 @@ from __future__ import print_function
 from __future__ import absolute_import
 from time import sleep
 
-from .vnrpc import RpcClient
+from vnpy.rpc import RpcClient
 
 
 class TestClient(RpcClient):
     """
     Test RpcClient   
-    """   
+    """
+
     def __init__(self, req_address, sub_address):
         """
         Constructor
diff --git a/vnpy/rpc/test_server.py b/vnpy/rpc/test_server.py
index ee4ca6e4..660168fc 100644
--- a/vnpy/rpc/test_server.py
+++ b/vnpy/rpc/test_server.py
@@ -2,14 +2,14 @@ from __future__ import print_function
 from __future__ import absolute_import
 from time import sleep, time
 
-from .vnrpc import RpcServer
+from vnpy.rpc import RpcServer
 
 
 class TestServer(RpcServer):
     """
     Test RpcServer
     """
-    
+
     def __init__(self, rep_address, pub_address):
         """
         Constructor
diff --git a/vnpy/rpc/vnrpc.py b/vnpy/rpc/vnrpc.py
index 3debfa65..1cdd835a 100644
--- a/vnpy/rpc/vnrpc.py
+++ b/vnpy/rpc/vnrpc.py
@@ -6,9 +6,9 @@ import zmq
 from msgpack import packb, unpackb
 from json import dumps, loads
 
-import cPickle
-p_dumps = cPickle.dumps
-p_loads = cPickle.loads
+import pickle
+p_dumps = pickle.dumps
+p_loads = pickle.loads
 
 
 # Achieve Ctrl-c interrupt recv
@@ -21,7 +21,7 @@ class RpcObject(object):
     1) maspack: higher performance, but usually requires the installation of msgpack related tools;
     2) jason: Slightly lower performance but versatility is better, most programming languages have built-in libraries;
     3) cPickle: Lower performance and only can be used in Python, but it is very convenient to transfer Python objects directly.
-   
+
     Therefore, it is recommended to use msgpack.
     Use json, if you want to communicate with some languages without providing msgpack.
     Use cPickle, when the data being transferred contains many custom Python objects.
@@ -115,10 +115,12 @@ class RpcServer(RpcObject):
         # Zmq port related
         self.__context = zmq.Context()
 
-        self.__socket_rep = self.__context.socket(zmq.REP)   # Reply socket (Request–reply pattern)
+        self.__socket_rep = self.__context.socket(
+            zmq.REP)   # Reply socket (Request–reply pattern)
         self.__socket_rep.bind(rep_address)
 
-        self.__socket_pub = self.__context.socket(zmq.PUB)   # Publish socket (Publish–subscribe pattern)
+        # Publish socket (Publish–subscribe pattern)
+        self.__socket_pub = self.__context.socket(zmq.PUB)
         self.__socket_pub.bind(pub_address)
 
         # Woker thread related
@@ -166,11 +168,13 @@ class RpcServer(RpcObject):
             name, args, kwargs = req
 
             # Try to get and execute callable function object; capture exception information if it fails
+            name = name.decode("UTF-8")
+
             try:
                 func = self.__functions[name]
                 r = func(*args, **kwargs)
                 rep = [True, r]
-            except Exception as e:
+            except Exception as e:  # noqa
                 rep = [False, traceback.format_exc()]
 
             # Pack response by serialization
@@ -184,10 +188,12 @@ class RpcServer(RpcObject):
         Publish data
         """
         # Serialized data
+        topic = bytes(topic, "UTF-8")
         datab = self.pack(data)
 
         # Send data by Publish socket
-        self.__socket_pub.send_multipart([topic, datab])  # topci must be ascii encoding
+        # topci must be ascii encoding
+        self.__socket_pub.send_multipart([topic, datab])
 
     def register(self, func):
         """
@@ -208,12 +214,15 @@ class RpcClient(RpcObject):
         self.__sub_address = sub_address
 
         self.__context = zmq.Context()
-        self.__socket_req = self.__context.socket(zmq.REQ)   # Request socket (Request–reply pattern)
-        self.__socket_sub = self.__context.socket(zmq.SUB)   # Subscribe socket (Publish–subscribe pattern)
+        # Request socket (Request–reply pattern)
+        self.__socket_req = self.__context.socket(zmq.REQ)
+        # Subscribe socket (Publish–subscribe pattern)
+        self.__socket_sub = self.__context.socket(zmq.SUB)
 
         # Woker thread relate, used to process data pushed from server
         self.__active = False                                   # RpcClient status
-        self.__thread = threading.Thread(target=self.run)       # RpcClient thread
+        self.__thread = threading.Thread(
+            target=self.run)       # RpcClient thread
 
     def __getattr__(self, name):
         """
@@ -238,7 +247,7 @@ class RpcClient(RpcObject):
             if rep[0]:
                 return rep[1]
             else:
-                raise RemoteException(rep[1])
+                raise RemoteException(rep[1].decode("UTF-8"))
 
         return dorpc
 
@@ -284,6 +293,8 @@ class RpcClient(RpcObject):
             data = self.unpack(datab)
 
             # Process data by callable function
+            topic = topic.decode("UTF-8")
+
             self.callback(topic, data)
 
     def callback(self, topic, data):
@@ -296,6 +307,7 @@ class RpcClient(RpcObject):
         """
         Subscribe data
         """
+        topic = bytes(topic, "UTF-8")
         self.__socket_sub.setsockopt(zmq.SUBSCRIBE, topic)