diff --git a/alias.txt b/alias.txt
index a209276..db90064 100644
--- a/alias.txt
+++ b/alias.txt
@@ -233,6 +233,10 @@ alias agy='apt upgrade -y'
 
 alias pir='pip install -r'
 
+function pir-cn() {
+  pip install -r $1 -i https://mirrors.ustc.edu.cn/pypi/web/simple
+}
+
 alias rm='rm -r'
 alias cp='cp -r'