diff --git a/build.sh b/build.sh
index 5a78fa0..eecbc49 100755
--- a/build.sh
+++ b/build.sh
@@ -30,7 +30,7 @@ for m in appbase rbac accounting llmage platformbiz msp cpcc unipay filemgr dapi
 do
 	echo "install $m module..."
 	cd $cdir/pkgs
-	if [ -d "$cdir/pkgs/$m" ];then
+	if [ ! -d "$cdir/pkgs/$m" ];then
 		git clone https://git.opencomputing.cn/yumoqing/$m
 		cd $cdir/pkgs/$m
 		if [ -d $cdir/pkgs/$m/models ];then