diff --git a/packages/sku/components/SkuHeader.vue b/packages/sku/components/SkuHeader.vue
index 2699ec5b9..188442cd7 100644
--- a/packages/sku/components/SkuHeader.vue
+++ b/packages/sku/components/SkuHeader.vue
@@ -1,5 +1,5 @@
 <template>
-  <div class="van-sku-header">
+  <div class="van-sku-header van-hairline--bottom">
     <div class="van-sku-header__img-wrap">
       <img class="van-sku__goods-img" :src="goodsImg">
     </div>
diff --git a/packages/sku/containers/SkuContainer.vue b/packages/sku/containers/SkuContainer.vue
index b79a0c3f2..67ba3a85c 100644
--- a/packages/sku/containers/SkuContainer.vue
+++ b/packages/sku/containers/SkuContainer.vue
@@ -13,7 +13,7 @@
         </slot>
         <div class="van-sku-body scroller" :style="bodyStyle">
           <slot name="sku-group" :selectedSku="selectedSku">
-            <div v-if="hasSku" class="van-sku-group-container">
+            <div v-if="hasSku" class="van-sku-group-container van-hairline--bottom">
               <div v-for="(skuTreeItem, index) in skuTree"
                 class="van-sku-row-group"
                 :key="index">
diff --git a/packages/vant-css/src/common/hairline.css b/packages/vant-css/src/common/hairline.css
index d68d84c37..31a9d9364 100644
--- a/packages/vant-css/src/common/hairline.css
+++ b/packages/vant-css/src/common/hairline.css
@@ -1,4 +1,4 @@
-@import "../mixins/border_retina.css";
+@import "../mixins/border-retina.css";
 
 .van-hairline {
   &,
diff --git a/packages/vant-css/src/mixins/border_retina.css b/packages/vant-css/src/mixins/border-retina.css
similarity index 100%
rename from packages/vant-css/src/mixins/border_retina.css
rename to packages/vant-css/src/mixins/border-retina.css
diff --git a/packages/vant-css/src/sku.css b/packages/vant-css/src/sku.css
index b83781c47..22ec430dd 100644
--- a/packages/vant-css/src/sku.css
+++ b/packages/vant-css/src/sku.css
@@ -20,12 +20,7 @@
 
   &-group-container {
     margin-left: 15px;
-    position: relative;
     padding: 12px 0 2px;
-
-    &::after {
-      @mixin border-retina (bottom);
-    }
   }
 
   &-row-group {
@@ -38,13 +33,8 @@
 
   /* sku header */
   &-header {
-    position: relative;
     margin-left: 15px;
 
-    &::after {
-      @mixin border-retina (bottom);
-    }
-
     &__img-wrap {
       position: relative;
       float: left;