diff --git a/packages/theme-chalk/src/timeline-item.scss b/packages/theme-chalk/src/timeline-item.scss
index 9ccaf34159..7e865118b1 100644
--- a/packages/theme-chalk/src/timeline-item.scss
+++ b/packages/theme-chalk/src/timeline-item.scss
@@ -43,7 +43,9 @@
     }
 
     @each $type in (primary, success, warning, danger, info) {
-      background-color: var(--el-color-#{$type});
+      @include m($type) {
+        background-color: var(--el-color-#{$type});
+      }
     }
   }