diff --git a/installer/dectl b/installer/dectl
index f17e7df2b2..35944b2d7e 100644
--- a/installer/dectl
+++ b/installer/dectl
@@ -301,7 +301,7 @@ function clear_images() {
          component_version=$(echo ${component_image_defined} | awk -F":" '{print $3}' | uniq)
          component_image=$(echo ${component_image_defined} | awk -F'image: ' '{print $2}' | awk -F':' '{print $1}')
 
-         if test -z $(docker images | grep "$component_image" | grep -v " $component_version "); then
+         if [[ $(docker images | grep "$component_image" | grep -v " $component_version ") == 0 ]]; then
             echo "$component_image 不存在旧版本镜像"
          else
             echo "存在旧版本镜像 : "