diff --git a/packages/components/image-viewer/image-viewer.wxml b/packages/components/image-viewer/image-viewer.wxml
index f37a01c64..57e7449ac 100644
--- a/packages/components/image-viewer/image-viewer.wxml
+++ b/packages/components/image-viewer/image-viewer.wxml
@@ -16,7 +16,7 @@
     class="{{classPrefix}}__mask"
     data-source="overlay"
     bind:tap="onClose"
-    style="{{ '--td-image-viewer-mask-bg-color: ' + backgroundColor }}"
+    style="{{_._style([backgroundColor && '--td-image-viewer-mask-bg-color: ' + backgroundColor])}}"
     aria-role="button"
     aria-label="关闭"
   />