diff --git a/Course/README.md b/Course/README.md
index 67b44ab..c7546a0 100644
--- a/Course/README.md
+++ b/Course/README.md
@@ -1,6 +1,8 @@
 # 教程类
 
-**教程类** |
-:---: |
-<a href="https://github.com/GcsSloop/AndroidNote/blob/master/Course/HowToUsePlantUMLInAS.md" target="_blank"><img src="http://ww4.sinaimg.cn/large/005Xtdi2jw1f2iwjcu945j30rs0dw41f.jpg" width=300 /></a> |
-<a href="https://github.com/GcsSloop/AndroidNote/blob/master/Course/ReleaseLibraryByJitPack.md" target="_blank"><img src="http://ww2.sinaimg.cn/large/005Xtdi2jw1f2iwkgdkugj30rs0dwgoi.jpg" width=300 /></a> |
+
+<p align="center">
+<a href="https://github.com/GcsSloop/AndroidNote/blob/master/Course/HowToUsePlantUMLInAS.md" target="_blank"><img src="http://ww2.sinaimg.cn/large/005Xtdi2gw1f6h5jfxzvaj30rs0dwgot.jpg" width=285 /></a>
+<a href="https://github.com/GcsSloop/AndroidNote/blob/master/Course/HowToUsePlantUMLInAS(Mac).md" target="_blank"><img src="http://ww3.sinaimg.cn/large/005Xtdi2gw1f6h5k3m8wrj30rs0dwq66.jpg" width=285 /></a>
+<a href="https://github.com/GcsSloop/AndroidNote/blob/master/Course/ReleaseLibraryByJitPack.md" target="_blank"><img src="http://ww2.sinaimg.cn/large/005Xtdi2gw1f6h5lbuiraj30rs0dwtbm.jpg" width=285 /></a>
+</p>