diff --git a/src/nav-bar/index.less b/src/nav-bar/index.less
index 1fed3ee1f..f86b4af9a 100644
--- a/src/nav-bar/index.less
+++ b/src/nav-bar/index.less
@@ -1,6 +1,7 @@
 @import '../style/var';
 
 .van-nav-bar {
+  position: relative;
   z-index: @nav-bar-z-index;
   line-height: @line-height-lg;
   text-align: center;