diff --git a/EssOS/项目分析.md b/EssOS/项目分析.md
index 3ce07ba..bead056 100644
--- a/EssOS/项目分析.md
+++ b/EssOS/项目分析.md
@@ -33,8 +33,7 @@ sequenceDiagram
 场景2
 
 ```flow
-graph TD;
-
+graph TB;
 st=>start: 开始
 e=>end: 结束
 op1=>operation: 填写信息