diff --git a/packages/abc/st/style/index.less b/packages/abc/st/style/index.less
index c7eef295ec..52cb82079d 100644
--- a/packages/abc/st/style/index.less
+++ b/packages/abc/st/style/index.less
@@ -23,6 +23,7 @@
   &__btn {
     &-sub {
       @{st-prefix}__btn-text {
+        width: 100%;
         color: inherit;
       }
     }