diff --git a/packages/nav-bar/index.vue b/packages/nav-bar/index.vue
index def66f312..261680a53 100644
--- a/packages/nav-bar/index.vue
+++ b/packages/nav-bar/index.vue
@@ -1,6 +1,6 @@
 <template>
   <div
-    class="van-nav-bar van-hairline--top-bottom"
+    class="van-nav-bar van-hairline--bottom"
     :class="{ 'van-nav-bar--fixed': fixed }"
     :style="style"
   >