diff --git a/README.md b/README.md
index a6c3300abf2bc4f1e4dbbfcbcf3ea20e3900910c..e24e19d48560775ecda275155af4110b2cce89e7 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,9 @@
 * [lab3](./Documentations/3-ir-gen/)
   + DDL：2022-11-13 23:59:59 (UTC+8)
 
+* [lab4.1](./Documentations/4.1-ssa/)
+  + DDL：2022-11-27 23:59:59 (UTC+8)
+
 ## FAQ: How to merge upstream remote branches
 
 In brief, you need another alias for upstream repository (we assume you are now in your local copy of forked repository on Gitlab):
diff --git a/Reports/4.1-ssa/report.md b/Reports/4.1-ssa/report.md
new file mode 100644
index 0000000000000000000000000000000000000000..9ed8fe617eb308dfa1e2b1cc141c4487a29dea2a
--- /dev/null
+++ b/Reports/4.1-ssa/report.md
@@ -0,0 +1,19 @@
+# Lab4.1 实验报告
+
+## 实验要求
+
+请按照自己的理解，写明本次实验需要干什么
+
+## 思考题
+### Mem2reg
+1. ...
+2. ...
+3. ...
+
+### 代码阅读总结
+
+此次实验有什么收获
+
+### 实验反馈 （可选 不会评分）
+
+对本次实验的建议