diff --git a/EssOS/项目分析.md b/EssOS/项目分析.md
index 732b06e..3ce07ba 100644
--- a/EssOS/项目分析.md
+++ b/EssOS/项目分析.md
@@ -33,6 +33,8 @@ sequenceDiagram
 场景2
 
 ```flow
+graph TD;
+
 st=>start: 开始
 e=>end: 结束
 op1=>operation: 填写信息