diff --git a/change_cdn.py b/change_cdn.py
deleted file mode 100755
index 9842e4c7..00000000
--- a/change_cdn.py
+++ /dev/null
@@ -1,22 +0,0 @@
-#!/usr/bin/python
-# coding:utf-8
-
-
-import os
-
-
-def iter(path):
-    for root, dirs, files in os.walk(path):
-        for fn in files:
-            if fn.endswith(".html"):
-                with open(root + '/' + fn, 'r') as f:
-                    content = f.read()
-                content = content.replace('<script src="https://cdnjs.cloudflare.com/ajax/libs/ace/1.1.3/ace.js"></script>', '<script src="http://cdn.bootcss.com/ace/1.1.3/ace.js"></script>').replace('<script src="https://cdnjs.cloudflare.com/ajax/libs/ace/1.1.3/mode-javascript.js"></script>', '<script src="http://cdn.bootcss.com/ace/1.1.3/mode-javascript.js"></script>')
-                insert_pos = content.find("</li>", content.find("Generated using GitBook")) + 6
-                content = content[:insert_pos] + '''<li style="margin-left:15%;"> <iframe  src="http://ghbtns.com/github-btn.html?user=numbbbbb&repo=the-swift-programming-language-in-chinese&type=watch&count=true&size=large"
-  allowtransparency="true" frameborder="0" scrolling="0" width="170" height="30"></iframe></li>''' + content[insert_pos:]
-                content.replace(r'<title>.*?</title>', "<title>《The Swift Programming Language》完整中文版</title>")
-                with open(root + '/' + fn, 'w') as f:
-                    f.write(content)
-
-iter(os.getcwd())