diff --git a/EssOS/项目分析.md b/EssOS/项目分析.md
index 4dec93a..732b06e 100644
--- a/EssOS/项目分析.md
+++ b/EssOS/项目分析.md
@@ -32,7 +32,25 @@ sequenceDiagram
 
 场景2
 
-
+```flow
+st=>start: 开始
+e=>end: 结束
+op1=>operation: 填写信息
+op2=>operation: 填写完成
+op3=>operation: 支付学费
+op4=>operation: 完成报到
+cond=>condition: 是否填写完成
+cond2=>condition: 是否支付学费
+cond3=>condition: 是否完成报到
+
+st->op1->cond
+cond(yes)->op2->cond2
+cond(no)->op3->cond2
+cond2(yes)->op4->cond3
+cond2(no)->op3->cond3
+cond3(yes)->e
+cond3(no)->op1
+```