diff --git a/src/dropdown-item/index.less b/src/dropdown-item/index.less
index 1c292fb26..71653d91e 100644
--- a/src/dropdown-item/index.less
+++ b/src/dropdown-item/index.less
@@ -4,6 +4,7 @@
   position: fixed;
   right: 0;
   left: 0;
+  z-index: @dropdown-item-z-index;
   overflow: hidden;
 
   &__option {
diff --git a/src/dropdown-menu/index.js b/src/dropdown-menu/index.js
index cad919636..a0c5551d9 100644
--- a/src/dropdown-menu/index.js
+++ b/src/dropdown-menu/index.js
@@ -19,15 +19,12 @@ export default createComponent({
   ],
 
   props: {
+    zIndex: Number,
     activeColor: String,
     overlay: {
       type: Boolean,
       default: true,
     },
-    zIndex: {
-      type: Number,
-      default: 10,
-    },
     duration: {
       type: Number,
       default: 0.2,
diff --git a/src/dropdown-menu/test/__snapshots__/demo.spec.js.snap b/src/dropdown-menu/test/__snapshots__/demo.spec.js.snap
index 30cb1b513..5afee72d1 100644
--- a/src/dropdown-menu/test/__snapshots__/demo.spec.js.snap
+++ b/src/dropdown-menu/test/__snapshots__/demo.spec.js.snap
@@ -7,12 +7,12 @@ exports[`renders demo correctly 1`] = `
       <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title"><div class="van-ellipsis">全部商品</div></span></div>
       <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title"><div class="van-ellipsis">默认排序</div></span></div>
       <div>
-        <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px; display: none;">
+        <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px; display: none;">
           <!---->
         </div>
       </div>
       <div>
-        <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px; display: none;">
+        <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px; display: none;">
           <!---->
         </div>
       </div>
@@ -23,12 +23,12 @@ exports[`renders demo correctly 1`] = `
       <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title"><div class="van-ellipsis">全部商品</div></span></div>
       <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title"><div class="van-ellipsis">筛选</div></span></div>
       <div>
-        <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px; display: none;">
+        <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px; display: none;">
           <!---->
         </div>
       </div>
       <div>
-        <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px; display: none;">
+        <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px; display: none;">
           <!---->
         </div>
       </div>
@@ -39,12 +39,12 @@ exports[`renders demo correctly 1`] = `
       <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title"><div class="van-ellipsis">全部商品</div></span></div>
       <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title"><div class="van-ellipsis">默认排序</div></span></div>
       <div>
-        <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px; display: none;">
+        <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px; display: none;">
           <!---->
         </div>
       </div>
       <div>
-        <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px; display: none;">
+        <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px; display: none;">
           <!---->
         </div>
       </div>
@@ -55,12 +55,12 @@ exports[`renders demo correctly 1`] = `
       <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title van-dropdown-menu__title--down"><div class="van-ellipsis">全部商品</div></span></div>
       <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title van-dropdown-menu__title--down"><div class="van-ellipsis">默认排序</div></span></div>
       <div>
-        <div class="van-dropdown-item van-dropdown-item--up" style="z-index: 10; bottom: 0px; display: none;">
+        <div class="van-dropdown-item van-dropdown-item--up" style="bottom: 0px; display: none;">
           <!---->
         </div>
       </div>
       <div>
-        <div class="van-dropdown-item van-dropdown-item--up" style="z-index: 10; bottom: 0px; display: none;">
+        <div class="van-dropdown-item van-dropdown-item--up" style="bottom: 0px; display: none;">
           <!---->
         </div>
       </div>
@@ -71,12 +71,12 @@ exports[`renders demo correctly 1`] = `
       <div role="button" tabindex="-1" class="van-dropdown-menu__item van-dropdown-menu__item--disabled"><span class="van-dropdown-menu__title"><div class="van-ellipsis">全部商品</div></span></div>
       <div role="button" tabindex="-1" class="van-dropdown-menu__item van-dropdown-menu__item--disabled"><span class="van-dropdown-menu__title"><div class="van-ellipsis">默认排序</div></span></div>
       <div>
-        <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px; display: none;">
+        <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px; display: none;">
           <!---->
         </div>
       </div>
       <div>
-        <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px; display: none;">
+        <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px; display: none;">
           <!---->
         </div>
       </div>
diff --git a/src/dropdown-menu/test/__snapshots__/index.spec.js.snap b/src/dropdown-menu/test/__snapshots__/index.spec.js.snap
index c21d68e16..c1293ee48 100644
--- a/src/dropdown-menu/test/__snapshots__/index.spec.js.snap
+++ b/src/dropdown-menu/test/__snapshots__/index.spec.js.snap
@@ -5,7 +5,7 @@ exports[`click option 1`] = `
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title"><div class="van-ellipsis">B</div></span></div>
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title"><div class="van-ellipsis">B</div></span></div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px;">
+    <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px;">
       <div class="van-overlay" style="z-index: 2013; animation-duration: 0.2s; position: absolute;" name="van-fade"></div>
       <div class="van-popup van-popup--top van-dropdown-item__content" style="transition-duration: 0.2s; display: none; z-index: 2014;" name="van-popup-slide-top">
         <div role="button" tabindex="0" class="van-cell van-cell--clickable van-dropdown-item__option">
@@ -20,7 +20,7 @@ exports[`click option 1`] = `
     </div>
   </div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px; display: none;">
+    <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px; display: none;">
       <!---->
     </div>
   </div>
@@ -32,7 +32,7 @@ exports[`close-on-click-outside 1`] = `
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title"><div class="van-ellipsis">A</div></span></div>
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title"><div class="van-ellipsis">A</div></span></div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px;">
+    <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px;">
       <div class="van-popup van-popup--top van-dropdown-item__content" style="transition-duration: 0.2s; display: none;" name="van-popup-slide-top">
         <div role="button" tabindex="0" class="van-cell van-cell--clickable van-dropdown-item__option van-dropdown-item__option--active">
           <div class="van-cell__title"><span>A</span></div>
@@ -46,7 +46,7 @@ exports[`close-on-click-outside 1`] = `
     </div>
   </div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px; display: none;">
+    <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px; display: none;">
       <!---->
     </div>
   </div>
@@ -58,7 +58,7 @@ exports[`destroy one item 1`] = `
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title"><div class="van-ellipsis">A</div></span></div>
   <!---->
   <div>
-    <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px; display: none;">
+    <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px; display: none;">
       <!---->
     </div>
   </div>
@@ -70,12 +70,12 @@ exports[`didn\`t find matched option 1`] = `
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title"><div class="van-ellipsis"></div></span></div>
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title"><div class="van-ellipsis"></div></span></div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px; display: none;">
+    <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px; display: none;">
       <!---->
     </div>
   </div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px; display: none;">
+    <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px; display: none;">
       <!---->
     </div>
   </div>
@@ -87,12 +87,12 @@ exports[`direction up 1`] = `
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title van-dropdown-menu__title--down"><div class="van-ellipsis">A</div></span></div>
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title van-dropdown-menu__title--down"><div class="van-ellipsis">A</div></span></div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--up" style="z-index: 10; bottom: 0px; display: none;">
+    <div class="van-dropdown-item van-dropdown-item--up" style="bottom: 0px; display: none;">
       <!---->
     </div>
   </div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--up" style="z-index: 10; bottom: 0px; display: none;">
+    <div class="van-dropdown-item van-dropdown-item--up" style="bottom: 0px; display: none;">
       <!---->
     </div>
   </div>
@@ -104,7 +104,7 @@ exports[`direction up 2`] = `
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title van-dropdown-menu__title--active"><div class="van-ellipsis">A</div></span></div>
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title van-dropdown-menu__title--down"><div class="van-ellipsis">A</div></span></div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--up" style="z-index: 10; bottom: 1000px;">
+    <div class="van-dropdown-item van-dropdown-item--up" style="bottom: 1000px;">
       <div class="van-popup van-popup--bottom van-dropdown-item__content" style="transition-duration: 0.2s;" name="van-popup-slide-bottom">
         <div role="button" tabindex="0" class="van-cell van-cell--clickable van-dropdown-item__option van-dropdown-item__option--active">
           <div class="van-cell__title"><span>A</span></div>
@@ -118,7 +118,7 @@ exports[`direction up 2`] = `
     </div>
   </div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--up" style="z-index: 10; bottom: 1000px; display: none;">
+    <div class="van-dropdown-item van-dropdown-item--up" style="bottom: 1000px; display: none;">
       <!---->
     </div>
   </div>
@@ -130,7 +130,7 @@ exports[`disable close-on-click-outside 1`] = `
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title van-dropdown-menu__title--active van-dropdown-menu__title--down"><div class="van-ellipsis">A</div></span></div>
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title"><div class="van-ellipsis">A</div></span></div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px;">
+    <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px;">
       <div class="van-popup van-popup--top van-dropdown-item__content" style="transition-duration: 0.2s;" name="van-popup-slide-top">
         <div role="button" tabindex="0" class="van-cell van-cell--clickable van-dropdown-item__option van-dropdown-item__option--active">
           <div class="van-cell__title"><span>A</span></div>
@@ -144,7 +144,7 @@ exports[`disable close-on-click-outside 1`] = `
     </div>
   </div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px; display: none;">
+    <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px; display: none;">
       <!---->
     </div>
   </div>
@@ -155,7 +155,7 @@ exports[`disable dropdown item 1`] = `
 <div class="van-dropdown-menu van-hairline--top-bottom">
   <div role="button" tabindex="-1" class="van-dropdown-menu__item van-dropdown-menu__item--disabled"><span class="van-dropdown-menu__title"><div class="van-ellipsis">A</div></span></div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px; display: none;">
+    <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px; display: none;">
       <!---->
     </div>
   </div>
@@ -167,7 +167,7 @@ exports[`render option icon 1`] = `
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title van-dropdown-menu__title--active van-dropdown-menu__title--down"><div class="van-ellipsis">A</div></span></div>
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title"><div class="van-ellipsis">A</div></span></div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px;">
+    <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px;">
       <div class="van-popup van-popup--top van-dropdown-item__content" style="transition-duration: 0.2s;" name="van-popup-slide-top">
         <div role="button" tabindex="0" class="van-cell van-cell--clickable van-dropdown-item__option van-dropdown-item__option--active"><i class="van-icon van-icon-success van-cell__left-icon">
             <!----></i>
@@ -183,7 +183,7 @@ exports[`render option icon 1`] = `
     </div>
   </div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px; display: none;">
+    <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px; display: none;">
       <!---->
     </div>
   </div>
@@ -195,7 +195,7 @@ exports[`show dropdown item 1`] = `
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title van-dropdown-menu__title--active van-dropdown-menu__title--down"><div class="van-ellipsis">A</div></span></div>
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title"><div class="van-ellipsis">A</div></span></div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px;">
+    <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px;">
       <div class="van-popup van-popup--top van-dropdown-item__content" style="transition-duration: 0.2s;" name="van-popup-slide-top">
         <div role="button" tabindex="0" class="van-cell van-cell--clickable van-dropdown-item__option van-dropdown-item__option--active">
           <div class="van-cell__title"><span>A</span></div>
@@ -209,7 +209,7 @@ exports[`show dropdown item 1`] = `
     </div>
   </div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px; display: none;">
+    <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px; display: none;">
       <!---->
     </div>
   </div>
@@ -221,7 +221,7 @@ exports[`show dropdown item 2`] = `
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title"><div class="van-ellipsis">A</div></span></div>
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title van-dropdown-menu__title--active van-dropdown-menu__title--down"><div class="van-ellipsis">A</div></span></div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px;">
+    <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px;">
       <div class="van-popup van-popup--top van-dropdown-item__content" style="transition-duration: 0s; display: none;" name="van-popup-slide-top">
         <div role="button" tabindex="0" class="van-cell van-cell--clickable van-dropdown-item__option van-dropdown-item__option--active">
           <div class="van-cell__title"><span>A</span></div>
@@ -235,7 +235,7 @@ exports[`show dropdown item 2`] = `
     </div>
   </div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px;">
+    <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px;">
       <div class="van-popup van-popup--top van-dropdown-item__content" style="transition-duration: 0.2s;" name="van-popup-slide-top">
         <div role="button" tabindex="0" class="van-cell van-cell--clickable van-dropdown-item__option van-dropdown-item__option--active">
           <div class="van-cell__title"><span>A</span></div>
@@ -256,7 +256,7 @@ exports[`show dropdown item 3`] = `
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title"><div class="van-ellipsis">A</div></span></div>
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title"><div class="van-ellipsis">A</div></span></div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px;">
+    <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px;">
       <div class="van-popup van-popup--top van-dropdown-item__content" style="transition-duration: 0s; display: none;" name="van-popup-slide-top">
         <div role="button" tabindex="0" class="van-cell van-cell--clickable van-dropdown-item__option van-dropdown-item__option--active">
           <div class="van-cell__title"><span>A</span></div>
@@ -270,7 +270,7 @@ exports[`show dropdown item 3`] = `
     </div>
   </div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px;">
+    <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px;">
       <div class="van-popup van-popup--top van-dropdown-item__content" style="transition-duration: 0.2s; display: none;" name="van-popup-slide-top">
         <div role="button" tabindex="0" class="van-cell van-cell--clickable van-dropdown-item__option van-dropdown-item__option--active">
           <div class="van-cell__title"><span>A</span></div>
@@ -291,12 +291,12 @@ exports[`title prop 1`] = `
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title"><div class="van-ellipsis">Title</div></span></div>
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title"><div class="van-ellipsis">Title</div></span></div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px; display: none;">
+    <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px; display: none;">
       <!---->
     </div>
   </div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px; display: none;">
+    <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px; display: none;">
       <!---->
     </div>
   </div>
@@ -309,7 +309,7 @@ exports[`title slot 1`] = `
             Custom Title
           </div></span></div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px; display: none;">
+    <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px; display: none;">
       <!---->
     </div>
   </div>
@@ -320,7 +320,7 @@ exports[`toggle method 1`] = `
 <div class="van-dropdown-menu van-hairline--top-bottom">
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title van-dropdown-menu__title--active van-dropdown-menu__title--down"><div class="van-ellipsis"></div></span></div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px;">
+    <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px;">
       <div class="van-overlay" style="z-index: 2017; animation-duration: 0s; position: absolute;" name="van-fade"></div>
       <div class="van-popup van-popup--top van-dropdown-item__content" style="transition-duration: 0s; z-index: 2018;" name="van-popup-slide-top"></div>
     </div>
@@ -332,7 +332,7 @@ exports[`toggle method 2`] = `
 <div class="van-dropdown-menu van-hairline--top-bottom">
   <div role="button" tabindex="0" class="van-dropdown-menu__item"><span class="van-dropdown-menu__title"><div class="van-ellipsis"></div></span></div>
   <div>
-    <div class="van-dropdown-item van-dropdown-item--down" style="z-index: 10; top: 0px;">
+    <div class="van-dropdown-item van-dropdown-item--down" style="top: 0px;">
       <div class="van-popup van-popup--top van-dropdown-item__content" style="transition-duration: 0s; z-index: 2018; display: none;" name="van-popup-slide-top"></div>
     </div>
   </div>
diff --git a/src/style/var.less b/src/style/var.less
index 77ce3b8ac..3926b3714 100644
--- a/src/style/var.less
+++ b/src/style/var.less
@@ -327,6 +327,7 @@
 @dropdown-menu-title-line-height: 18px;
 @dropdown-menu-option-active-color: @blue;
 @dropdown-menu-content-max-height: 80%;
+@dropdown-item-z-index: 10;
 
 // Field
 @field-label-width: 90px;