diff --git a/pages/apply/apply.js b/pages/apply/apply.js
index 2acce61..0caeaf2 100644
--- a/pages/apply/apply.js
+++ b/pages/apply/apply.js
@@ -467,12 +467,13 @@ Page({
       }
     }
 
+    // 同一项目只能选一个组别：点选时取消该项目下其他组别；再次点击已选项则取消
     const nextProjectGroups = this.data.projectGroups.map((p) => {
       if (p.projectId !== projectId) return p;
       return {
         ...p,
         groups: p.groups.map((g) => {
-          if (g.groupId !== groupId) return g;
+          if (g.groupId !== groupId) return { ...g, selected: false };
           return { ...g, selected: !g.selected };
         })
       };