diff --git a/source/assembly_test/docs.md b/source/assembly_test/docs.md
index 1cc063e..7ceb4ad 100644
--- a/source/assembly_test/docs.md
+++ b/source/assembly_test/docs.md
@@ -1,12 +1,8 @@
 # 组装和测试
 
-## 检查收货清单
-
-收件后打开包装，对照产品装箱单/发货清单进行清点，如有短缺请于三日内联系客服，过期不补。
-
-## 电气拓扑结构
-
+## 电气拓扑
 
+![](./imgs/electrical_topology.png)
 
 ## 组装
 
diff --git a/source/assembly_test/imgs/electrical_topology.png b/source/assembly_test/imgs/electrical_topology.png
new file mode 100644
index 0000000..3089c64
Binary files /dev/null and b/source/assembly_test/imgs/electrical_topology.png differ