diff --git a/README.md b/README.md
index fc9ff72..c45411b 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,10 @@
 # English-level-up-tips-for-Chinese
 
-英语水平等级示意图：
+## Gitbook链接
+
+https://www.gitbook.com/read/book/byoungd/english-level-up-tips-for-chinese
+
+## 英语水平等级
 
 ![CERF@2x.png](https://ooo.0o0.ooo/2017/06/05/5934bb9a2e3bc.png)
 >本图主要参考 http://www.coe.int/en/web/common-european-framework-reference-languages/table-1-cefr-3.3-common-reference-levels-global-scale
@@ -12,21 +16,21 @@
 
 ## 章节
 ### 已完成：
-[![understanding@2x.png](https://ooo.0o0.ooo/2017/06/08/5938b1227846c.png)](part-1/1-understanding.md)
+[![understanding@2x.png](assets/understanding@2x.png)](part-1/1-understanding.md)
 
-[![vocabulary@2x.png](https://ooo.0o0.ooo/2017/06/08/5938b12260bd2.png)](part-1/2-vocabulary.md)
+[![vocabulary@2x.png](assets/vocabulary@2x.png)](part-1/2-vocabulary.md)
 
-[![listening@2x.png](https://ooo.0o0.ooo/2017/06/08/5938b12272e11.png)](part-1/3-listening.md)
+[![listening@2x.png](assets/listening@2x.png)](part-1/3-listening.md)
 
-[![reading@2x.png](https://ooo.0o0.ooo/2017/06/08/5938b122741f4.png)](part-1/4-reading.md)
+[![reading@2x.png](assets/reading@2x.png)](part-1/4-reading.md)
 
-[![speaking@2x.png](https://ooo.0o0.ooo/2017/06/08/5938b1227a723.png)](part-1/5-speaking.md)
+[![speaking@2x.png](assets/speaking@2x.png)](part-1/5-speaking.md)
 
-[![Others@2x.png](https://ooo.0o0.ooo/2017/06/08/5938b1227583d.png)](part-2/x-misc.md)
+[![Others@2x.png](assets/Others@2x.png)](part-2/x-misc.md)
 
 ### 待完成：
 
-![ideas@2x.png](https://ooo.0o0.ooo/2017/06/09/593ab358d8634.png)
+![ideas@2x.png](assets/scheme@2x.png)
 
 方案篇是分别为学生党和在职人员量身定制的英语学习方案，如果不采用合适的学习计划，那么碎片时间能做的基本上只有提升词汇了。
 
@@ -35,7 +39,7 @@
 
 ---
 
-![writing@2x.png](https://ooo.0o0.ooo/2017/06/08/5938b12276b47.png)
+![writing@2x.png](assets/writing@2x.png)
 
 写作的要求很高，本人的写作水平并不自信，目前不敢妄言，恐误人子弟；
 也不愿推荐几本语法书、写作书就草草了事，
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