diff --git a/packages/theme/src/dialog-box/index.less b/packages/theme/src/dialog-box/index.less
index 2f958ee1e7..3832dbddbb 100644
--- a/packages/theme/src/dialog-box/index.less
+++ b/packages/theme/src/dialog-box/index.less
@@ -205,7 +205,6 @@
   top: 0;
   width: 100%;
   height: 100%;
-  opacity: 0.3;
   background: var(--tv-DialogBox-mask-bg-color);
 }