diff --git a/miniapp/pages/index/index.js b/miniapp/pages/index/index.js
index 255e6a5..15f82b5 100644
--- a/miniapp/pages/index/index.js
+++ b/miniapp/pages/index/index.js
@@ -221,6 +221,17 @@ function normalizeColumnIndexArray(indices) {
     .sort((a, b) => a - b);
 }
 
+/**
+ * 将列索引数组转换为布尔映射，供 WXML 直接按下标判断选中态。
+ */
+function buildColumnSelectedMap(indices) {
+  const map = {};
+  normalizeColumnIndexArray(indices).forEach((index) => {
+    map[index] = true;
+  });
+  return map;
+}
+
 /**
  * 统一错误文案：
  * - xlsx 解析能力缺失时，固定提示用户去“构建 npm”
@@ -530,6 +541,8 @@ Page({
     sourceDataColumn: null,
     sourceDescriptionColumns: [],
     targetDescriptionColumns: [],
+    sourceDescSelectedMap: {},
+    targetDescSelectedMap: {},
     sectionVisibleSourceData: true,
     sectionVisibleSourceDesc: true,
     sectionVisibleTargetDesc: true,
@@ -950,7 +963,9 @@ Page({
         tableRows: rows,
         sourceDataColumn,
         sourceDescriptionColumns,
-        targetDescriptionColumns
+        targetDescriptionColumns,
+        sourceDescSelectedMap: buildColumnSelectedMap(sourceDescriptionColumns),
+        targetDescSelectedMap: buildColumnSelectedMap(targetDescriptionColumns)
       },
       () => {
         this.rebuildSankey();
@@ -982,7 +997,8 @@ Page({
       : normalizeColumnIndexArray(current.concat(index));
     this.setData(
       {
-        sourceDescriptionColumns: next
+        sourceDescriptionColumns: next,
+        sourceDescSelectedMap: buildColumnSelectedMap(next)
       },
       () => {
         this.rebuildSankey();
@@ -1002,7 +1018,8 @@ Page({
       : normalizeColumnIndexArray(current.concat(index));
     this.setData(
       {
-        targetDescriptionColumns: next
+        targetDescriptionColumns: next,
+        targetDescSelectedMap: buildColumnSelectedMap(next)
       },
       () => {
         this.rebuildSankey();
diff --git a/miniapp/pages/index/index.wxml b/miniapp/pages/index/index.wxml
index 49c8dcd..1927844 100644
--- a/miniapp/pages/index/index.wxml
+++ b/miniapp/pages/index/index.wxml
@@ -133,7 +133,7 @@
               <image src="../../assets/icons/description.svg" mode="aspectFit" />
               <text class="label">{{item}}</text>
               <image
-                src="{{(sourceDescriptionColumns.indexOf(index) > -1 || sourceDescriptionColumns.indexOf(index + '') > -1) ? '../../assets/icons/checkbox.svg' : '../../assets/icons/checkbox-no.svg'}}"
+                src="{{sourceDescSelectedMap[index] ? '../../assets/icons/checkbox.svg' : '../../assets/icons/checkbox-no.svg'}}"
                 mode="aspectFit"
               />
             </view>
@@ -155,7 +155,7 @@
               <image src="../../assets/icons/description.svg" mode="aspectFit" />
               <text class="label">{{item}}</text>
               <image
-                src="{{(targetDescriptionColumns.indexOf(index) > -1 || targetDescriptionColumns.indexOf(index + '') > -1) ? '../../assets/icons/checkbox.svg' : '../../assets/icons/checkbox-no.svg'}}"
+                src="{{targetDescSelectedMap[index] ? '../../assets/icons/checkbox.svg' : '../../assets/icons/checkbox-no.svg'}}"
                 mode="aspectFit"
               />
             </view>