diff -r 18f1012e0c56 Doc/library/xmlrpc.server.rst
--- a/Doc/library/xmlrpc.server.rst	Fri Jun 10 14:26:32 2016 +0300
+++ b/Doc/library/xmlrpc.server.rst	Wed Jun 15 23:15:49 2016 +0800
@@ -86,6 +86,9 @@
    string, and may contain characters not legal in Python identifiers, including
    the period character.
 
+   .. versionadded:: 3.6
+      :meth:`register_function` can be used as a decorator now.
+
 
 .. method:: SimpleXMLRPCServer.register_instance(instance, allow_dotted_names=False)
 
diff -r 18f1012e0c56 Lib/test/test_xmlrpc.py
--- a/Lib/test/test_xmlrpc.py	Fri Jun 10 14:26:32 2016 +0300
+++ b/Lib/test/test_xmlrpc.py	Wed Jun 15 23:15:49 2016 +0800
@@ -456,10 +456,6 @@
             def getData():
                 return '42'
 
-    def my_function():
-        '''This is my function'''
-        return True
-
     class MyXMLRPCServer(xmlrpc.server.SimpleXMLRPCServer):
         def get_request(self):
             # Ensure the socket is always non-blocking.  On Linux, socket
@@ -486,9 +482,14 @@
         serv.register_introspection_functions()
         serv.register_multicall_functions()
         serv.register_function(pow)
-        serv.register_function(lambda x,y: x+y, 'add')
         serv.register_function(lambda x: x, 'têšt')
-        serv.register_function(my_function)
+        @serv.register_function
+        def my_function():
+            '''This is my function'''
+            return True
+        @serv.register_function(name='add')
+        def _(x, y):
+            return x + y
         testInstance = TestInstanceClass()
         serv.register_instance(testInstance, allow_dotted_names=True)
         evt.set()
diff -r 18f1012e0c56 Lib/xmlrpc/server.py
--- a/Lib/xmlrpc/server.py	Fri Jun 10 14:26:32 2016 +0300
+++ b/Lib/xmlrpc/server.py	Wed Jun 15 23:15:49 2016 +0800
@@ -106,6 +106,7 @@
 
 from xmlrpc.client import Fault, dumps, loads, gzip_encode, gzip_decode
 from http.server import BaseHTTPRequestHandler
+from functools import partial
 import http.server
 import socketserver
 import sys
@@ -204,17 +205,22 @@
         self.instance = instance
         self.allow_dotted_names = allow_dotted_names
 
-    def register_function(self, function, name=None):
+    def register_function(self, function=None, name=None):
         """Registers a function to respond to XML-RPC requests.
 
         The optional name argument can be used to set a Unicode name
         for the function.
         """
+        # decorator factory
+        if function is None:
+            return partial(self.register_function, name=name)
 
         if name is None:
             name = function.__name__
         self.funcs[name] = function
 
+        return function
+
     def register_introspection_functions(self):
         """Registers the XML-RPC introspection methods in the system
         namespace.