diff --git a/src/button/index.less b/src/button/index.less
index 0c668126d..0201d95c6 100644
--- a/src/button/index.less
+++ b/src/button/index.less
@@ -2,7 +2,9 @@
 
 .van-button {
   position: relative;
-  display: inline-block;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
   box-sizing: border-box;
   height: @button-default-height;
   margin: 0;
@@ -14,7 +16,6 @@
   cursor: pointer;
   transition: opacity @animation-duration-fast;
   -webkit-appearance: none;
-  -webkit-text-size-adjust: 100%;
 
   &::before {
     position: absolute;
@@ -95,7 +96,6 @@
   &--large {
     width: 100%;
     height: @button-large-height;
-    line-height: @button-large-line-height;
   }
 
   &--normal {
@@ -108,21 +108,16 @@
     height: @button-small-height;
     padding: 0 @padding-xs;
     font-size: @button-small-font-size;
-    line-height: @button-small-line-height;
   }
 
   &__loading {
-    display: inline-block;
     color: inherit;
-    vertical-align: top;
   }
 
   &--mini {
-    display: inline-block;
     min-width: @button-mini-min-width;
     height: @button-mini-height;
     font-size: @button-mini-font-size;
-    line-height: @button-mini-line-height;
 
     & + .van-button--mini {
       margin-left: @padding-base;
@@ -130,7 +125,7 @@
   }
 
   &--block {
-    display: block;
+    display: flex;
     width: 100%;
   }
 
@@ -155,14 +150,11 @@
     min-width: 1em;
     font-size: 1.2em;
     line-height: inherit;
-    vertical-align: top;
   }
 
   &__icon + &__text,
   &__loading + &__text {
-    display: inline-block;
     margin-left: 5px;
-    vertical-align: top;
   }
 
   &--hairline {
diff --git a/src/calendar/index.less b/src/calendar/index.less
index 57367a37e..1daca2cfe 100644
--- a/src/calendar/index.less
+++ b/src/calendar/index.less
@@ -184,6 +184,5 @@
   &__confirm {
     height: @calendar-confirm-button-height;
     margin: @calendar-confirm-button-margin;
-    line-height: @calendar-confirm-button-line-height;
   }
 }
diff --git a/src/sku/index.less b/src/sku/index.less
index fb6abc264..e587d91af 100644
--- a/src/sku/index.less
+++ b/src/sku/index.less
@@ -329,7 +329,6 @@
       height: 40px;
       font-weight: @font-weight-bold;
       font-size: @font-size-md;
-      line-height: 34px;
       border: none;
       border-radius: 0;
 
diff --git a/src/style/var.less b/src/style/var.less
index 003e63200..061adfddb 100644
--- a/src/style/var.less
+++ b/src/style/var.less
@@ -110,16 +110,13 @@
 @button-mini-height: 22px;
 @button-mini-min-width: 50px;
 @button-mini-font-size: @font-size-xs;
-@button-mini-line-height: 20px;
 @button-small-height: 30px;
 @button-small-font-size: @font-size-sm;
 @button-small-min-width: 60px;
-@button-small-line-height: 28px;
 @button-normal-font-size: @font-size-md;
 @button-large-height: 50px;
-@button-large-line-height: 48px;
 @button-default-height: 44px;
-@button-default-line-height: 42px;
+@button-default-line-height: 1.5;
 @button-default-font-size: @font-size-lg;
 @button-default-color: @text-color;
 @button-default-background-color: @white;
@@ -168,7 +165,6 @@
 @calendar-day-disabled-color: @gray-5;
 @calendar-confirm-button-height: 36px;
 @calendar-confirm-button-margin: 7px 0;
-@calendar-confirm-button-line-height: 34px;
 
 // Card
 @card-padding: @padding-xs @padding-md;
diff --git a/src/submit-bar/index.less b/src/submit-bar/index.less
index eb3f5170a..7d7f7cd28 100644
--- a/src/submit-bar/index.less
+++ b/src/submit-bar/index.less
@@ -69,7 +69,6 @@
     width: @submit-bar-button-width;
     height: @submit-bar-button-height;
     font-weight: @font-weight-bold;
-    line-height: @submit-bar-button-height;
     border: none;
 
     &--danger {