diff --git a/examples/simple_rpc/test_client.py b/examples/simple_rpc/test_client.py
index 57dd0909..22689971 100644
--- a/examples/simple_rpc/test_client.py
+++ b/examples/simple_rpc/test_client.py
@@ -25,7 +25,7 @@ class TestClient(RpcClient):
 
 if __name__ == "__main__":
     req_address = "tcp://localhost:2014"
-    sub_address = "tcp://localhost:0602"
+    sub_address = "tcp://localhost:4102"
 
     tc = TestClient(req_address, sub_address)
     tc.subscribe_topic("")
diff --git a/examples/simple_rpc/test_server.py b/examples/simple_rpc/test_server.py
index 3589bead..2839b861 100644
--- a/examples/simple_rpc/test_server.py
+++ b/examples/simple_rpc/test_server.py
@@ -10,11 +10,11 @@ class TestServer(RpcServer):
     Test RpcServer
     """
 
-    def __init__(self, rep_address, pub_address):
+    def __init__(self):
         """
         Constructor
         """
-        super(TestServer, self).__init__(rep_address, pub_address)
+        super(TestServer, self).__init__()
 
         self.register(self.add)
 
@@ -28,10 +28,10 @@ class TestServer(RpcServer):
 
 if __name__ == "__main__":
     rep_address = "tcp://*:2014"
-    pub_address = "tcp://*:0602"
+    pub_address = "tcp://*:4102"
 
-    ts = TestServer(rep_address, pub_address)
-    ts.start()
+    ts = TestServer()
+    ts.start(rep_address, pub_address)
 
     while 1:
         content = f"current server time is {time()}"
diff --git a/vnpy/rpc/__init__.py b/vnpy/rpc/__init__.py
index f12a1c83..13fdd4fd 100644
--- a/vnpy/rpc/__init__.py
+++ b/vnpy/rpc/__init__.py
@@ -2,6 +2,7 @@ import threading
 import traceback
 import signal
 import zmq
+from typing import Any, Callable
 
 
 # Achieve Ctrl-c interrupt recv
@@ -29,7 +30,7 @@ class RemoteException(Exception):
 class RpcServer:
     """"""
 
-    def __init__(self, rep_address, pub_address):
+    def __init__(self):
         """
         Constructor
         """
@@ -41,20 +42,22 @@ class RpcServer:
 
         # Reply socket (Request–reply pattern)
         self.__socket_rep = self.__context.socket(zmq.REP)
-        self.__socket_rep.bind(rep_address)
 
         # Publish socket (Publish–subscribe pattern)
         self.__socket_pub = self.__context.socket(zmq.PUB)
-        self.__socket_pub.bind(pub_address)
 
         # Worker thread related
         self.__active = False                               # RpcServer status
         self.__thread = threading.Thread(target=self.run)   # RpcServer thread
 
-    def start(self):
+    def start(self, rep_address: str, pub_address: str):
         """
         Start RpcServer
         """
+        # Bind socket address
+        self.__socket_rep.bind(rep_address)
+        self.__socket_pub.bind(pub_address)
+
         # Start RpcServer status
         self.__active = True
 
@@ -62,7 +65,7 @@ class RpcServer:
         if not self.__thread.isAlive():
             self.__thread.start()
 
-    def stop(self, join=False):
+    def stop(self, join: bool = False):
         """
         Stop RpcServer
         """
@@ -73,6 +76,10 @@ class RpcServer:
         if join and self.__thread.isAlive():
             self.__thread.join()
 
+        # Unbind socket address
+        self.__socket_pub.unbind(self.__socket_pub.LAST_ENDPOINT)
+        self.__socket_rep.unbind(self.__socket_rep.LAST_ENDPOINT)
+
     def run(self):
         """
         Run RpcServer functions
@@ -99,13 +106,13 @@ class RpcServer:
             # send callable response by Reply socket
             self.__socket_rep.send_pyobj(rep)
 
-    def publish(self, topic, data):
+    def publish(self, topic: str, data: Any):
         """
         Publish data
         """
         self.__socket_pub.send_pyobj([topic, data])
 
-    def register(self, func):
+    def register(self, func: Callable):
         """
         Register function
         """
@@ -115,10 +122,8 @@ class RpcServer:
 class RpcClient:
     """"""
 
-    def __init__(self, req_address, sub_address):
+    def __init__(self, req_address: str, sub_address: str):
         """Constructor"""
-        super(RpcClient, self).__init__()
-
         # zmq port related
         self.__req_address = req_address
         self.__sub_address = sub_address
@@ -134,7 +139,7 @@ class RpcClient:
         self.__thread = threading.Thread(
             target=self.run)       # RpcClient thread
 
-    def __getattr__(self, name):
+    def __getattr__(self, name: str):
         """
         Realize remote call function
         """
@@ -172,7 +177,7 @@ class RpcClient:
 
     def stop(self):
         """
-        Stop RpcClient 
+        Stop RpcClient
         """
         # Stop RpcClient status
         self.__active = False
@@ -196,13 +201,13 @@ class RpcClient:
             # Process data by callable function
             self.callback(topic, data)
 
-    def callback(self, topic, data):
+    def callback(self, topic: str, data: Any):
         """
         Callable function
         """
         raise NotImplementedError
 
-    def subscribe_topic(self, topic):
+    def subscribe_topic(self, topic: str):
         """
         Subscribe data
         """