diff --git a/free-programming-books-zh.md b/free-programming-books-zh.md
index fdc774828..f93dd4ca6 100644
--- a/free-programming-books-zh.md
+++ b/free-programming-books-zh.md
@@ -49,6 +49,8 @@
 * [Udacity](https://www.udacity.com/)
 * [xuetangX](https://www.xuetangx.com/)
 * [慕课网](http://www.imooc.com/course/list)(丰富的移动端开发、php开发、web前端、html5教程以及css3视频教程等课程资源)
+* [极客学院](http://www.jikexueyuan.com/)
+* [51CTO学院](http://edu.51cto.com/)
 
 #### 软件开发方法
 * [傻瓜函数编程](https://github.com/justinyhuang/Functional-Programming-For-The-Rest-of-Us-Cn) (《Functional Programming For The Rest of Us》中文版)
@@ -61,6 +63,7 @@
 * [鸟哥的 Linux 私房菜 基础学习篇](http://vbird.dic.ksu.edu.tw/linux_basic/linux_basic.php)
 * [鸟哥的 Linux 私房菜 服务器架设篇](http://vbird.dic.ksu.edu.tw/linux_server/)
 * [Operating Systems: Three Easy Pieces](http://pages.cs.wisc.edu/~remzi/OSTEP/)
+* [uCore Lab: Operating System Course in Tsinghua University](https://www.gitbook.com/book/objectkuan/ucore-docs/details)
 
 #### 版本控制
 * [Git - 简易指南](http://rogerdudler.github.io/git-guide/index.zh.html)