diff --git a/script/tools/delete_iso.sh b/script/tools/delete_iso.sh
index de73ad91429426a1dea9d18734ee2dc68dbf0338..83a9c0e535667e9257309a81296e6dc6e6e25758 100644
--- a/script/tools/delete_iso.sh
+++ b/script/tools/delete_iso.sh
@@ -3,7 +3,7 @@
 echo "--------------- start delete older iso ----------------"
 DIR=$1
 my_key=$2
-ISO_DAYS=30
+ISO_DAYS=$3
 TODAY=`date +%s`
 files=`ssh -i $my_key -o StrictHostKeyChecking=no root@121.36.84.172 "ls $DIR | grep openeuler-"`