diff --git a/docs/desc.md b/docs/desc.md
index ee53ae2..3c29aca 100644
--- a/docs/desc.md
+++ b/docs/desc.md
@@ -1,9 +1,8 @@
 # 实现原理
 
-基于tls链接，protobuf进行数据传输，下面举例在办公网络穿透到家庭网络，
-并通过rdp进行连接家庭网络下的某台windows设备
+基于tls链接，protobuf进行数据传输，下面举例远程连接服务器集群内的某台主机
 
-![rdp](imgs/example.jpg)
+![shell](imgs/example.jpg)
 
 server端配置(10.0.1.1)：
 
@@ -17,9 +16,9 @@ server端配置(10.0.1.1)：
       key: /dir/to/tls/key/file # tls密钥
       crt: /dir/to/tls/crt/file # tls证书
 
-家庭网络client配置(192.168.1.100)：
+服务器client配置(192.168.1.100)：
 
-    id: home              # 客户端ID
+    id: server            # 客户端ID
     server: 10.0.1.1:6154 # 服务器地址
     secret: 0123456789    # 预共享密钥，必须与server端相同，否则握手失败
     log:
@@ -38,27 +37,24 @@ server端配置(10.0.1.1)：
       rotate: 7   # 保留数量
     rules:                          # 远端rule列表可为空
       - name: rdp                   # 链路名称
-        target: home                # 目标客户端ID
-        type: tcp                   # 连接类型tcp或udp
+        target: server              # 目标客户端ID
+        type: shell                 # 连接类型tcp或udp
         local_addr: 0.0.0.0         # 本地监听地址
         local_port: 3389            # 本地监听端口号
-        remote_addr: 192.168.1.101  # 目标客户端连接地址
-        remote_port: 3389           # 目标客户端连接端口号
 
 工作流程如下：
 
 1. 办公网络与家庭网络中的np-cli创建tls连接到np-svr
 2. np-cli服务发送握手包，并将配置文件中的secret字段进行md5哈希
 3. np-svr等待握手报文，若等待超时则为非法链接，直接断开
-4. 办公网络客户机创建新连接到172.16.1.100的3389端口
-5. 172.16.1.100上的np-cli接收到新请求后创建新的link并生成链接id
-6. 172.16.1.100上的np-cli发送connect_request消息，告知连接类型和链接目标地址和端口
-7. np-svr转发connect_request消息至192.168.1.100上的np-cli
-8. 192.168.1.100上的np-cli接收到connect_request消息，根据请求信息创建链接到目标地址和端口
-9. 192.168.1.100上的np-cli根据链接创建结果返回connect_response消息
-10. np-svr转发connect_response消息至172.16.1.100上的np-cli
-11. 172.168.1.100上的np-cli接收到connect_response消息后根据是否成功来决定是否需要断开rdp客户端链接
-12. 链路打通，两端各自发送data消息到对应链路
+4. 用户打开办公网络主机172.16.1.100上的终端页面，并连接到服务器集群中的主机server
+5. 172.16.1.100上的np-cli发送connect_request消息，并将连接类型设置为shell
+6. np-svr转发connect_request消息至192.168.1.100上的np-cli
+7. 192.168.1.100上的np-cli接收到connect_request消息，创建/bin/bash进程
+8. 192.168.1.100上的np-cli根据链接创建结果返回connect_response消息
+9. np-svr转发connect_response消息至172.16.1.100上的np-cli
+10. 172.168.1.100上的np-cli接收connect_response消息
+11. 开始转发网页上的输入输出内容
 
 ## 软件架构
 
diff --git a/docs/imgs/example.drawio b/docs/imgs/example.drawio
index 5a25734..53f172b 100644
--- a/docs/imgs/example.drawio
+++ b/docs/imgs/example.drawio
@@ -1,158 +1 @@
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