diff --git a/src/page/index/sidebar/index.vue b/src/page/index/sidebar/index.vue
index e98ce1f..ef2f0e7 100644
--- a/src/page/index/sidebar/index.vue
+++ b/src/page/index/sidebar/index.vue
@@ -44,6 +44,19 @@ export default {
       collect(this.menu);
       return indexes;
     },
+    // 全站菜单路径集合，用于子路由（如 /vehicle/customer-archive/form）回退高亮父菜单
+    menuPaths() {
+      const props = website.menu;
+      const set = new Set();
+      const collect = list => {
+        (list || []).forEach(item => {
+          if (item[props.path]) set.add(item[props.path]);
+          collect(item[props.children]);
+        });
+      };
+      collect(this.menu);
+      return set;
+    },
     activeMenu() {
       const route = this.$route;
       const { meta, path } = route;
@@ -55,6 +68,15 @@ export default {
       if (fullPath !== path && this.menuIndexes.has(fullPath)) {
         return fullPath;
       }
+      // 子路由（如 /vehicle/customer-archive/form）自动回退高亮最长前缀匹配的父菜单
+      if (!this.menuPaths.has(path)) {
+        const matched = [...this.menuPaths]
+          .filter(p => path.startsWith(p + '/'))
+          .sort((a, b) => b.length - a.length);
+        if (matched.length) {
+          return matched[0];
+        }
+      }
       return path;
     },
   },