diff -Nur old\test\test_xmlrpc.py new\test\test_xmlrpc.py
--- old\test\test_xmlrpc.py	Thu Aug 13 18:30:32 2009
+++ new\test\test_xmlrpc.py	Sat Mar 20 19:39:48 2010
@@ -478,6 +478,14 @@
         # This avoids waiting for the socket timeout.
         self.test_simple1()
 
+    def test_call_with_tuple_param(self):
+        def execute(server, methodname, *args):
+            r = getattr(server, methodname)(args) # params become a tuple
+            return r
+        p = xmlrpclib.ServerProxy(URL)
+        r = execute(p, "add", 4,7)
+        self.assertEqual(r, 11)
+
 # This is a contrived way to make a failure occur on the server side
 # in order to test the _send_traceback_header flag on the server
 class FailingMessageClass(http.client.HTTPMessage):
diff -Nur old\xmlrpc\client.py new\xmlrpc\client.py
--- old\xmlrpc\client.py	Thu Jun 04 17:11:52 2009
+++ new\xmlrpc\client.py	Sat Mar 20 19:41:03 2010
@@ -49,6 +49,7 @@
 # 2003-07-12 gp  Correct marshalling of Faults
 # 2003-10-31 mvl Add multicall support
 # 2004-08-20 mvl Bump minimum supported Python version to 2.1
+# 2010-03-20 cgd Avoid to make a tuple to be another tuple(Chenguodong email:sinojelly@gmail.com)
 #
 # Copyright (c) 1999-2002 by Secret Labs AB.
 # Copyright (c) 1999-2002 by Fredrik Lundh.
@@ -1026,6 +1027,9 @@
     def __getattr__(self, name):
         return _Method(self.__send, "%s.%s" % (self.__name, name))
     def __call__(self, *args):
+        # Fixed by sinojelly: if args[0] is a tuple, should not make it to be another tuple.
+        if len(args) == 1 and type(args[0]) is type(()):
+            args = args[0]
         return self.__send(self.__name, args)
 
 ##