diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -34,10 +34,6 @@
 1. [Go语言并发编程](https://talks.godoc.org/github.com/chai2010/awesome-go-zh/chai2010/chai2010-golang-concurrency.slide) - [chai2010](https://github.com/chai2010/awesome-go-zh/tree/master/chai2010) 武汉·光谷猫友会 2018/09/16, [整理01](https://mp.weixin.qq.com/s/UaY9gJU85dq-dXlOhLYY1Q)/[整理02](https://mp.weixin.qq.com/s/_aKNO-H11GEDA-l0rycfQQ)
 1. 深入CGO编程: https://github.com/chai2010/gopherchina2018-cgo-talk
 
-## 武汉·光谷码农微信群
-
-![](http://pr68a1oh5.bkt.clouddn.com/weixin-guanggu-coder.jpg)
-
 ## 关注微信公众号 (guanggu-coder)
 
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diff --git a/preface.md b/preface.md
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--- a/preface.md
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@@ -13,10 +13,6 @@
 - https://chai2010.cn/advanced-go-programming-book/
 - https://www.gitbook.com/book/chai2010/advanced-go-programming-book/
 
-## 加入光谷码农
-
-![](https://chai2010.cn/static-images/weixin-guanggu-coder-qun.jpg)
-
 ## 关注微信公众号 (guanggu-coder)
 
 ![](weixin-guanggu-coder.jpg)