diff --git a/bi/base.css b/bi/base.css
index 1ced609f64..8270c9fb0e 100644
--- a/bi/base.css
+++ b/bi/base.css
@@ -33,6 +33,7 @@
 /****** common color(常用颜色,可用于普遍场景) *****/
 /**** custom color(自定义颜色,用于特定场景) ****/
 .bi-bubble-combo .bubble-combo-triangle-left {
+  z-index: 1;
   width: 0;
   height: 0;
   border-top: 6px solid transparent;
@@ -40,6 +41,7 @@
   border-bottom: 6px solid transparent;
 }
 .bi-bubble-combo .bubble-combo-triangle-right {
+  z-index: 1;
   width: 0;
   height: 0;
   border-top: 6px solid transparent;
@@ -47,6 +49,7 @@
   border-bottom: 6px solid transparent;
 }
 .bi-bubble-combo .bubble-combo-triangle-top {
+  z-index: 1;
   width: 0;
   height: 0;
   border-left: 6px solid transparent;
@@ -54,6 +57,7 @@
   border-top: 6px solid #3f8ce8;
 }
 .bi-bubble-combo .bubble-combo-triangle-bottom {
+  z-index: 1;
   width: 0;
   height: 0;
   border-left: 6px solid transparent;
diff --git a/docs/base.css b/docs/base.css
index 1ced609f64..8270c9fb0e 100644
--- a/docs/base.css
+++ b/docs/base.css
@@ -33,6 +33,7 @@
 /****** common color(常用颜色,可用于普遍场景) *****/
 /**** custom color(自定义颜色,用于特定场景) ****/
 .bi-bubble-combo .bubble-combo-triangle-left {
+  z-index: 1;
   width: 0;
   height: 0;
   border-top: 6px solid transparent;
@@ -40,6 +41,7 @@
   border-bottom: 6px solid transparent;
 }
 .bi-bubble-combo .bubble-combo-triangle-right {
+  z-index: 1;
   width: 0;
   height: 0;
   border-top: 6px solid transparent;
@@ -47,6 +49,7 @@
   border-bottom: 6px solid transparent;
 }
 .bi-bubble-combo .bubble-combo-triangle-top {
+  z-index: 1;
   width: 0;
   height: 0;
   border-left: 6px solid transparent;
@@ -54,6 +57,7 @@
   border-top: 6px solid #3f8ce8;
 }
 .bi-bubble-combo .bubble-combo-triangle-bottom {
+  z-index: 1;
   width: 0;
   height: 0;
   border-left: 6px solid transparent;
diff --git a/src/css/base/combo/combo.bubble.css b/src/css/base/combo/combo.bubble.css
index 88aaf0f0ef..b2c553173c 100644
--- a/src/css/base/combo/combo.bubble.css
+++ b/src/css/base/combo/combo.bubble.css
@@ -2,6 +2,7 @@
 /****** common color(常用颜色,可用于普遍场景) *****/
 /**** custom color(自定义颜色,用于特定场景) ****/
 .bi-bubble-combo .bubble-combo-triangle-left {
+  z-index: 1;
   width: 0;
   height: 0;
   border-top: 6px solid transparent;
@@ -9,6 +10,7 @@
   border-bottom: 6px solid transparent;
 }
 .bi-bubble-combo .bubble-combo-triangle-right {
+  z-index: 1;
   width: 0;
   height: 0;
   border-top: 6px solid transparent;
@@ -16,6 +18,7 @@
   border-bottom: 6px solid transparent;
 }
 .bi-bubble-combo .bubble-combo-triangle-top {
+  z-index: 1;
   width: 0;
   height: 0;
   border-left: 6px solid transparent;
@@ -23,6 +26,7 @@
   border-top: 6px solid #3f8ce8;
 }
 .bi-bubble-combo .bubble-combo-triangle-bottom {
+  z-index: 1;
   width: 0;
   height: 0;
   border-left: 6px solid transparent;
diff --git a/src/less/base/combo/combo.bubble.less b/src/less/base/combo/combo.bubble.less
index 8eac71ceab..fdca540795 100644
--- a/src/less/base/combo/combo.bubble.less
+++ b/src/less/base/combo/combo.bubble.less
@@ -2,15 +2,19 @@
 
 .bi-bubble-combo {
   & .bubble-combo-triangle-left {
+    z-index: 1;
     .solid-triangle-right(@color-bi-background-highlight);
   }
   & .bubble-combo-triangle-right {
+    z-index: 1;
     .solid-triangle-left(@color-bi-background-highlight);
   }
   & .bubble-combo-triangle-top {
+    z-index: 1;
     .solid-triangle-down(@color-bi-background-highlight);
   }
   & .bubble-combo-triangle-bottom {
+    z-index: 1;
     .solid-triangle-up(@color-bi-background-highlight);
   }
 }
\ No newline at end of file