diff --git a/src/less/widget/multiselect/trigger/button.checkselected.less b/src/less/widget/multiselect/trigger/button.checkselected.less
index 35c00dec0..b02c76e80 100644
--- a/src/less/widget/multiselect/trigger/button.checkselected.less
+++ b/src/less/widget/multiselect/trigger/button.checkselected.less
@@ -3,7 +3,8 @@
 .bi-multi-select-check-selected-button {
   z-index: 1;
   min-width: 16px;
-  .border-radius(8px);
+  .border-radius(50%);
+
   &:active {
     color: @color-bi-text-highlight;
     background-color: @color-bi-background-multi-select-trigger-check-selected;