diff --git a/packages/tree-select/index.wxml b/packages/tree-select/index.wxml
index 0e8df176..d6f95a8a 100644
--- a/packages/tree-select/index.wxml
+++ b/packages/tree-select/index.wxml
@@ -6,7 +6,7 @@
   style="height: {{ innerHeight }}"
 >
   <scroll-view scroll-y class="van-tree-select__nav">
-    <van-sidebar bind:change="onClickNav" custom-class="van-tree-select__nav__inner">
+    <van-sidebar active-key="{{ mainActiveIndex }}" bind:change="onClickNav" custom-class="van-tree-select__nav__inner">
       <van-sidebar-item
         wx:for="{{ items }}"
         wx:key="index"