diff --git a/playbook/roles/flagger-loadtester/files/setup.sh b/playbook/roles/flagger-loadtester/files/setup.sh
index 9ebb0f03..7334450c 100644
--- a/playbook/roles/flagger-loadtester/files/setup.sh
+++ b/playbook/roles/flagger-loadtester/files/setup.sh
@@ -10,7 +10,7 @@ check_not_empty() {
 }
 
 # 检查参数是否为空
-check_not_empty "$1" "DOMAIN" && DOMAIN=$3
+check_not_empty "$1" "DOMAIN" && DOMAIN=$1
 
 helm repo add flagger https://flagger.app
 kubectl create ns monitoring || true