diff --git a/README.md b/README.md
index 102045b..c3f92ea 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,8 @@
 # 102201121
-
+```mermaid
+graph TD;
+  A-->B;
+  A-->C;
+  B-->D;
+  C-->D;
+```