diff --git a/doc/27.AT_Firmware_and_SAL_Firmware_User_Guide.md b/doc/27.AT_Firmware_and_SAL_Firmware_User_Guide.md
index 2fd49300..aa420d4f 100644
--- a/doc/27.AT_Firmware_and_SAL_Firmware_User_Guide.md
+++ b/doc/27.AT_Firmware_and_SAL_Firmware_User_Guide.md
@@ -64,7 +64,11 @@ SAL框架全称Socket Abstract Layer，提供了类似socket网络编程的抽
 
 ## 2.1. 整体架构
 
-<应该放一张整体架构图，待画...>
+
+
+![AT_SAL_architecture](./image/AT_Firmware/AT_SAL_architecture.png)
+
+
 
 ## 2.2. 实现原理
 
diff --git a/doc/image/AT_Firmware/AT_SAL_architecture.png b/doc/image/AT_Firmware/AT_SAL_architecture.png
new file mode 100644
index 00000000..999fedbe
Binary files /dev/null and b/doc/image/AT_Firmware/AT_SAL_architecture.png differ