diff --git a/init.sh b/init.sh
index 0e191d5..499b952 100755
--- a/init.sh
+++ b/init.sh
@@ -17,28 +17,10 @@ AWD=$(dirname "$SCRIPT")
 choose_sites(){
     case $MIRROR_SOURCE in
         1)
-            MIRROR_URL=https://mirrors.nju.edu.cn/debian/
-            SEC_URL=https://mirrors.nju.edu.cn/debian-security
-            DOCKER_URL=https://mirrors.nju.edu.cn/docker-ce/linux/debian
-            PVE_URL=https://mirrors.nju.edu.cn/proxmox/debian/pve
-            ;;
-        2)
-            MIRROR_URL=https://mirrors.xjtu.edu.cn/debian/
-            SEC_URL=https://mirrors.xjtu.edu.cn/debian-security
-            DOCKER_URL=https://mirrors.xjtu.edu.cn/docker-ce/linux/debian
-            PVE_URL=https://mirrors.ustc.edu.cn/proxmox/debian/pve
-            ;;
-        3)
-            MIRROR_URL=https://mirrors.ustc.edu.cn/debian/
-            SEC_URL=https://mirrors.ustc.edu.cn/debian-security
-            DOCKER_URL=https://mirrors.ustc.edu.cn/docker-ce/linux/debian
-            PVE_URL=https://mirrors.ustc.edu.cn/proxmox/debian/pve
-            ;;
-        4)
-            MIRROR_URL=https://mirrors.tuna.tsinghua.edu.cn/debian/
-            SEC_URL=https://mirrors.tuna.tsinghua.edu.cn/debian-security
-            DOCKER_URL=https://mirrors.tuna.tsinghua.edu.cn/docker-ce/linux/debian
-            PVE_URL=https://mirrors.tuna.tsinghua.edu.cn/proxmox/debian/pve
+            MIRROR_URL=https://mirrors.cernet.edu.cn/debian/
+            SEC_URL=https://mirrors.cernet.edu.cn/debian-security
+            DOCKER_URL=https://mirrors.cernet.edu.cn/docker-ce/linux/debian
+            PVE_URL=https://mirrors.cernet.edu.cn/proxmox/debian/pve
             ;;
         *)
             MIRROR_URL=https://deb.debian.org/debian/
@@ -121,10 +103,7 @@ usage(){
     echo "    -c                    config only";
     echo "    -m <CHOICE>           apt mirror source";
     echo "            *             official"
-    echo "            1             nju (default)"
-    echo "            2             xjtu"
-    echo "            3             ustc"
-    echo "            4             tsinghua"
+    echo "            1             cernet (default)"
 }
 
 PKG_BASE="$AWD/packages-base"