diff --git a/src/number-keyboard/index.js b/src/number-keyboard/index.js
index 29a57489a..2b4253f7a 100644
--- a/src/number-keyboard/index.js
+++ b/src/number-keyboard/index.js
@@ -24,6 +24,7 @@ export default createComponent({
   props: {
     show: Boolean,
     title: String,
+    zIndex: Number,
     closeButtonText: String,
     deleteButtonText: String,
     theme: {
@@ -42,10 +43,6 @@ export default createComponent({
       type: [Number, String],
       default: Number.MAX_VALUE,
     },
-    zIndex: {
-      type: Number,
-      default: 100,
-    },
     transition: {
       type: Boolean,
       default: true,
diff --git a/src/number-keyboard/index.less b/src/number-keyboard/index.less
index c1b1081ae..476b4c8ce 100644
--- a/src/number-keyboard/index.less
+++ b/src/number-keyboard/index.less
@@ -4,6 +4,7 @@
   position: fixed;
   bottom: 0;
   left: 0;
+  z-index: @number-keyboard-z-index;
   width: 100%;
   background-color: @number-keyboard-background-color;
   animation-timing-function: ease-out;
diff --git a/src/number-keyboard/test/__snapshots__/demo.spec.js.snap b/src/number-keyboard/test/__snapshots__/demo.spec.js.snap
index f5282f24a..f27b78b4d 100644
--- a/src/number-keyboard/test/__snapshots__/demo.spec.js.snap
+++ b/src/number-keyboard/test/__snapshots__/demo.spec.js.snap
@@ -5,7 +5,7 @@ exports[`renders demo correctly 1`] = `
   <div><button class="van-button van-button--primary van-button--normal"><span class="van-button__text">
       弹出默认键盘
     </span></button>
-    <div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" style="z-index: 100;" name="van-slide-up">
+    <div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" name="van-slide-up">
       <div class="van-number-keyboard__title van-hairline--top"><span role="button" tabindex="0" class="van-number-keyboard__close">完成</span></div>
       <div class="van-number-keyboard__body"><i role="button" tabindex="0" class="van-hairline van-key">1</i><i role="button" tabindex="0" class="van-hairline van-key">2</i><i role="button" tabindex="0" class="van-hairline van-key">3</i><i role="button" tabindex="0" class="van-hairline van-key">4</i><i role="button" tabindex="0" class="van-hairline van-key">5</i><i role="button" tabindex="0" class="van-hairline van-key">6</i><i role="button" tabindex="0" class="van-hairline van-key">7</i><i role="button" tabindex="0" class="van-hairline van-key">8</i><i role="button" tabindex="0" class="van-hairline van-key">9</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--extra">.</i><i role="button" tabindex="0" class="van-hairline van-key">0</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--delete">删除</i></div>
     </div>
@@ -13,7 +13,7 @@ exports[`renders demo correctly 1`] = `
   <div><button class="van-button van-button--info van-button--normal"><span class="van-button__text">
       弹出自定义键盘
     </span></button>
-    <div class="van-number-keyboard van-number-keyboard--custom van-number-keyboard--safe-area-inset-bottom" style="z-index: 100; display: none;" name="van-slide-up">
+    <div class="van-number-keyboard van-number-keyboard--custom van-number-keyboard--safe-area-inset-bottom" style="display: none;" name="van-slide-up">
       <div class="van-number-keyboard__body"><i role="button" tabindex="0" class="van-hairline van-key">1</i><i role="button" tabindex="0" class="van-hairline van-key">2</i><i role="button" tabindex="0" class="van-hairline van-key">3</i><i role="button" tabindex="0" class="van-hairline van-key">4</i><i role="button" tabindex="0" class="van-hairline van-key">5</i><i role="button" tabindex="0" class="van-hairline van-key">6</i><i role="button" tabindex="0" class="van-hairline van-key">7</i><i role="button" tabindex="0" class="van-hairline van-key">8</i><i role="button" tabindex="0" class="van-hairline van-key">9</i><i role="button" tabindex="0" class="van-hairline van-key van-key--middle">0</i><i role="button" tabindex="0" class="van-hairline van-key van-key--extra">.</i>
         <div class="van-number-keyboard__sidebar"><i role="button" tabindex="0" class="van-hairline van-key van-key--delete van-key--big van-key--gray van-key--delete">删除</i><i role="button" tabindex="0" class="van-hairline van-key van-key--blue van-key--big van-key--close">完成</i></div>
       </div>
@@ -25,14 +25,14 @@ exports[`renders demo correctly 1`] = `
         <div class="van-field__body"><input type="text" readonly="readonly" placeholder="点此输入" class="van-field__control"></div>
       </div>
     </div>
-    <div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" style="z-index: 100; display: none;" name="van-slide-up">
+    <div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" style="display: none;" name="van-slide-up">
       <div class="van-number-keyboard__body"><i role="button" tabindex="0" class="van-hairline van-key">1</i><i role="button" tabindex="0" class="van-hairline van-key">2</i><i role="button" tabindex="0" class="van-hairline van-key">3</i><i role="button" tabindex="0" class="van-hairline van-key">4</i><i role="button" tabindex="0" class="van-hairline van-key">5</i><i role="button" tabindex="0" class="van-hairline van-key">6</i><i role="button" tabindex="0" class="van-hairline van-key">7</i><i role="button" tabindex="0" class="van-hairline van-key">8</i><i role="button" tabindex="0" class="van-hairline van-key">9</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--extra"></i><i role="button" tabindex="0" class="van-hairline van-key">0</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--delete">删除</i></div>
     </div>
   </div>
   <div><button class="van-button van-button--primary van-button--normal van-button--plain"><span class="van-button__text">
       弹出身份证号码键盘
     </span></button>
-    <div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" style="z-index: 100; display: none;" name="van-slide-up">
+    <div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" style="display: none;" name="van-slide-up">
       <div class="van-number-keyboard__title van-hairline--top"><span role="button" tabindex="0" class="van-number-keyboard__close">完成</span></div>
       <div class="van-number-keyboard__body"><i role="button" tabindex="0" class="van-hairline van-key">1</i><i role="button" tabindex="0" class="van-hairline van-key">2</i><i role="button" tabindex="0" class="van-hairline van-key">3</i><i role="button" tabindex="0" class="van-hairline van-key">4</i><i role="button" tabindex="0" class="van-hairline van-key">5</i><i role="button" tabindex="0" class="van-hairline van-key">6</i><i role="button" tabindex="0" class="van-hairline van-key">7</i><i role="button" tabindex="0" class="van-hairline van-key">8</i><i role="button" tabindex="0" class="van-hairline van-key">9</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--extra">X</i><i role="button" tabindex="0" class="van-hairline van-key">0</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--delete">删除</i></div>
     </div>
@@ -40,7 +40,7 @@ exports[`renders demo correctly 1`] = `
   <div><button class="van-button van-button--info van-button--normal van-button--plain"><span class="van-button__text">
       弹出自定义标题键盘
     </span></button>
-    <div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" style="z-index: 100; display: none;" name="van-slide-up">
+    <div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" style="display: none;" name="van-slide-up">
       <div class="van-number-keyboard__title van-hairline--top"><span>键盘标题</span><span role="button" tabindex="0" class="van-number-keyboard__close">完成</span></div>
       <div class="van-number-keyboard__body"><i role="button" tabindex="0" class="van-hairline van-key">1</i><i role="button" tabindex="0" class="van-hairline van-key">2</i><i role="button" tabindex="0" class="van-hairline van-key">3</i><i role="button" tabindex="0" class="van-hairline van-key">4</i><i role="button" tabindex="0" class="van-hairline van-key">5</i><i role="button" tabindex="0" class="van-hairline van-key">6</i><i role="button" tabindex="0" class="van-hairline van-key">7</i><i role="button" tabindex="0" class="van-hairline van-key">8</i><i role="button" tabindex="0" class="van-hairline van-key">9</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--extra">.</i><i role="button" tabindex="0" class="van-hairline van-key">0</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--delete">删除</i></div>
     </div>
diff --git a/src/number-keyboard/test/__snapshots__/index.spec.js.snap b/src/number-keyboard/test/__snapshots__/index.spec.js.snap
index 32df57937..4a390c729 100644
--- a/src/number-keyboard/test/__snapshots__/index.spec.js.snap
+++ b/src/number-keyboard/test/__snapshots__/index.spec.js.snap
@@ -1,50 +1,50 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`extra-key slot 1`] = `
-<div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" style="z-index: 100; display: none;" name="van-slide-up">
+<div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" style="display: none;" name="van-slide-up">
   <div class="van-number-keyboard__body"><i role="button" tabindex="0" class="van-hairline van-key">1</i><i role="button" tabindex="0" class="van-hairline van-key">2</i><i role="button" tabindex="0" class="van-hairline van-key">3</i><i role="button" tabindex="0" class="van-hairline van-key">4</i><i role="button" tabindex="0" class="van-hairline van-key">5</i><i role="button" tabindex="0" class="van-hairline van-key">6</i><i role="button" tabindex="0" class="van-hairline van-key">7</i><i role="button" tabindex="0" class="van-hairline van-key">8</i><i role="button" tabindex="0" class="van-hairline van-key">9</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--extra">Custom Extra Key</i><i role="button" tabindex="0" class="van-hairline van-key">0</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--delete">删除</i></div>
 </div>
 `;
 
 exports[`focus on key 1`] = `
-<div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" style="z-index: 100; display: none;" name="van-slide-up">
+<div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" style="display: none;" name="van-slide-up">
   <div class="van-number-keyboard__body"><i role="button" tabindex="0" class="van-hairline van-key van-key--active">1</i><i role="button" tabindex="0" class="van-hairline van-key">2</i><i role="button" tabindex="0" class="van-hairline van-key">3</i><i role="button" tabindex="0" class="van-hairline van-key">4</i><i role="button" tabindex="0" class="van-hairline van-key">5</i><i role="button" tabindex="0" class="van-hairline van-key">6</i><i role="button" tabindex="0" class="van-hairline van-key">7</i><i role="button" tabindex="0" class="van-hairline van-key">8</i><i role="button" tabindex="0" class="van-hairline van-key">9</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--extra"></i><i role="button" tabindex="0" class="van-hairline van-key">0</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--delete">删除</i></div>
 </div>
 `;
 
 exports[`focus on key 2`] = `
-<div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" style="z-index: 100; display: none;" name="van-slide-up">
+<div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" style="display: none;" name="van-slide-up">
   <div class="van-number-keyboard__body"><i role="button" tabindex="0" class="van-hairline van-key">1</i><i role="button" tabindex="0" class="van-hairline van-key">2</i><i role="button" tabindex="0" class="van-hairline van-key">3</i><i role="button" tabindex="0" class="van-hairline van-key">4</i><i role="button" tabindex="0" class="van-hairline van-key">5</i><i role="button" tabindex="0" class="van-hairline van-key">6</i><i role="button" tabindex="0" class="van-hairline van-key">7</i><i role="button" tabindex="0" class="van-hairline van-key">8</i><i role="button" tabindex="0" class="van-hairline van-key">9</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--extra"></i><i role="button" tabindex="0" class="van-hairline van-key">0</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--delete">删除</i></div>
 </div>
 `;
 
 exports[`move and blur key 1`] = `
-<div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" style="z-index: 100; display: none;" name="van-slide-up">
+<div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" style="display: none;" name="van-slide-up">
   <div class="van-number-keyboard__body"><i role="button" tabindex="0" class="van-hairline van-key van-key--active">1</i><i role="button" tabindex="0" class="van-hairline van-key">2</i><i role="button" tabindex="0" class="van-hairline van-key">3</i><i role="button" tabindex="0" class="van-hairline van-key">4</i><i role="button" tabindex="0" class="van-hairline van-key">5</i><i role="button" tabindex="0" class="van-hairline van-key">6</i><i role="button" tabindex="0" class="van-hairline van-key">7</i><i role="button" tabindex="0" class="van-hairline van-key">8</i><i role="button" tabindex="0" class="van-hairline van-key">9</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--extra"></i><i role="button" tabindex="0" class="van-hairline van-key">0</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--delete">删除</i></div>
 </div>
 `;
 
 exports[`move and blur key 2`] = `
-<div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" style="z-index: 100; display: none;" name="van-slide-up">
+<div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" style="display: none;" name="van-slide-up">
   <div class="van-number-keyboard__body"><i role="button" tabindex="0" class="van-hairline van-key van-key--active">1</i><i role="button" tabindex="0" class="van-hairline van-key">2</i><i role="button" tabindex="0" class="van-hairline van-key">3</i><i role="button" tabindex="0" class="van-hairline van-key">4</i><i role="button" tabindex="0" class="van-hairline van-key">5</i><i role="button" tabindex="0" class="van-hairline van-key">6</i><i role="button" tabindex="0" class="van-hairline van-key">7</i><i role="button" tabindex="0" class="van-hairline van-key">8</i><i role="button" tabindex="0" class="van-hairline van-key">9</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--extra"></i><i role="button" tabindex="0" class="van-hairline van-key">0</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--delete">删除</i></div>
 </div>
 `;
 
 exports[`move and blur key 3`] = `
-<div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" style="z-index: 100; display: none;" name="van-slide-up">
+<div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" style="display: none;" name="van-slide-up">
   <div class="van-number-keyboard__body"><i role="button" tabindex="0" class="van-hairline van-key">1</i><i role="button" tabindex="0" class="van-hairline van-key">2</i><i role="button" tabindex="0" class="van-hairline van-key">3</i><i role="button" tabindex="0" class="van-hairline van-key">4</i><i role="button" tabindex="0" class="van-hairline van-key">5</i><i role="button" tabindex="0" class="van-hairline van-key">6</i><i role="button" tabindex="0" class="van-hairline van-key">7</i><i role="button" tabindex="0" class="van-hairline van-key">8</i><i role="button" tabindex="0" class="van-hairline van-key">9</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--extra"></i><i role="button" tabindex="0" class="van-hairline van-key">0</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--delete">删除</i></div>
 </div>
 `;
 
 exports[`render title 1`] = `
-<div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" style="z-index: 100; display: none;" name="van-slide-up">
+<div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" style="display: none;" name="van-slide-up">
   <div class="van-number-keyboard__title van-hairline--top"><span>Title</span><span role="button" tabindex="0" class="van-number-keyboard__close">Close</span></div>
   <div class="van-number-keyboard__body"><i role="button" tabindex="0" class="van-hairline van-key">1</i><i role="button" tabindex="0" class="van-hairline van-key">2</i><i role="button" tabindex="0" class="van-hairline van-key">3</i><i role="button" tabindex="0" class="van-hairline van-key">4</i><i role="button" tabindex="0" class="van-hairline van-key">5</i><i role="button" tabindex="0" class="van-hairline van-key">6</i><i role="button" tabindex="0" class="van-hairline van-key">7</i><i role="button" tabindex="0" class="van-hairline van-key">8</i><i role="button" tabindex="0" class="van-hairline van-key">9</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--extra"></i><i role="button" tabindex="0" class="van-hairline van-key">0</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--delete">删除</i></div>
 </div>
 `;
 
 exports[`title-left slot 1`] = `
-<div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" style="z-index: 100; display: none;" name="van-slide-up">
+<div class="van-number-keyboard van-number-keyboard--default van-number-keyboard--safe-area-inset-bottom" style="display: none;" name="van-slide-up">
   <div class="van-number-keyboard__title van-hairline--top"><span class="van-number-keyboard__title-left">Custom Title Left</span></div>
   <div class="van-number-keyboard__body"><i role="button" tabindex="0" class="van-hairline van-key">1</i><i role="button" tabindex="0" class="van-hairline van-key">2</i><i role="button" tabindex="0" class="van-hairline van-key">3</i><i role="button" tabindex="0" class="van-hairline van-key">4</i><i role="button" tabindex="0" class="van-hairline van-key">5</i><i role="button" tabindex="0" class="van-hairline van-key">6</i><i role="button" tabindex="0" class="van-hairline van-key">7</i><i role="button" tabindex="0" class="van-hairline van-key">8</i><i role="button" tabindex="0" class="van-hairline van-key">9</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--extra"></i><i role="button" tabindex="0" class="van-hairline van-key">0</i><i role="button" tabindex="0" class="van-hairline van-key van-key--gray van-key--delete">删除</i></div>
 </div>
diff --git a/src/style/var.less b/src/style/var.less
index 5989dd020..711556a7a 100644
--- a/src/style/var.less
+++ b/src/style/var.less
@@ -468,6 +468,7 @@
 @number-keyboard-cursor-width: 1px;
 @number-keyboard-cursor-height: 40%;
 @number-keyboard-cursor-animation-duration: 1s;
+@number-keyboard-z-index: 100;
 
 // Overlay
 @overlay-background-color: rgba(0, 0, 0, 0.7);