diff --git a/scripts/install_dev.sh b/scripts/install_dev.sh
index a44795a5c..cde638325 100755
--- a/scripts/install_dev.sh
+++ b/scripts/install_dev.sh
@@ -11,7 +11,6 @@ if [ -f /www/server/mdserver-web/tools.py ];then
 	exit 0
 fi
 
-
 echo -e "您正在安装的是\033[31mmdserver-web测试版\033[0m，非开发测试用途请使用正式版 install.sh ！" 
 echo -e "You are installing\033[31m mdserver-web dev version\033[0m, normally use install.sh for production.\n" 
 sleep 1
diff --git a/scripts/install_new.sh b/scripts/install_new.sh
index 608a2d556..cde638325 100755
--- a/scripts/install_new.sh
+++ b/scripts/install_new.sh
@@ -4,6 +4,13 @@ export PATH
 # LANG=en_US.UTF-8
 is64bit=`getconf LONG_BIT`
 
+if [ -f /www/server/mdserver-web/tools.py ];then
+	echo -e "存在旧版代码,不能安装!,已知风险的情况下" 
+	echo -e "rm -rf /www/server/mdserver-web"
+	echo -e "可安装!" 
+	exit 0
+fi
+
 echo -e "您正在安装的是\033[31mmdserver-web测试版\033[0m，非开发测试用途请使用正式版 install.sh ！" 
 echo -e "You are installing\033[31m mdserver-web dev version\033[0m, normally use install.sh for production.\n" 
 sleep 1