diff --git a/docs/static_files/high_performance_rpc_with_netty.md b/docs/static_files/high_performance_rpc_with_netty.md
index 03e55802..2dddf1be 100644
--- a/docs/static_files/high_performance_rpc_with_netty.md
+++ b/docs/static_files/high_performance_rpc_with_netty.md
@@ -30,26 +30,26 @@
 
 * ### <a name="26u3hn"></a>__远程调用客户端图解__
 
-<img src="img/client.png"/>
+    <img src="img/client.png"/>
 
     若是netty4.x的线程模型, IO Thread(worker) —> Map<InvokeId, Future>代替全局Map能更好的避免线程竞争
 
 * ### <a name="gembty"></a>__远程调用服务端图解__
 
-<img src="img/server.png"/>
+    <img src="img/server.png"/>
 
     重要概念: RPC三元组 <ID, Request, Response>
 
 * ### <a name="othccm"></a>__远程调用传输层图解__
 
-<img src="img/transport.png"/>
+    <img src="img/transport.png"/>
 
     左图为客户端, 右图为服务端
 
 * ### <a name="millbg"></a>__设计传输层协议栈__
     __协议头__
 
-<img src="img/protocol.png"/>
+    <img src="img/protocol.png"/>
 
     
 __协议体__