diff --git a/backend/app/api/wechat.py b/backend/app/api/wechat.py
index 9ac2dd7..873d150 100644
--- a/backend/app/api/wechat.py
+++ b/backend/app/api/wechat.py
@@ -5,7 +5,7 @@ from sqlalchemy.orm import selectinload
 
 from app.core.deps import get_current_user
 from app.db.database import get_db
-from app.db.models import ClassMembership, User
+from app.db.models import ClassMembership, Class_, User
 from app.schemas.user import TokenResponse, build_user_out
 from app.schemas.wechat import (
     WeChatBindRequest,
@@ -28,6 +28,31 @@ from app.services.wechat_service import (
 router = APIRouter(prefix="/api/wechat", tags=["wechat"])
 
 
+async def _find_approved_member_for_wechat_bind(
+    db: AsyncSession,
+    invite_code: str,
+    student_id: str,
+) -> tuple[User, int] | None:
+    result = await db.execute(
+        select(User, ClassMembership.class_id)
+        .join(ClassMembership, ClassMembership.user_id == User.id)
+        .join(Class_, Class_.id == ClassMembership.class_id)
+        .options(
+            selectinload(User.memberships),
+            selectinload(User.memberships).selectinload(ClassMembership.class_),
+        )
+        .where(
+            Class_.invite_code == invite_code,
+            User.student_id == student_id,
+            User.status == "approved",
+        )
+    )
+    row = result.first()
+    if row is None:
+        return None
+    return row[0], row[1]
+
+
 @router.post("/login", response_model=WeChatLoginResponse)
 async def wechat_login(req: WeChatLoginRequest, db: AsyncSession = Depends(get_db)):
     session = await exchange_code_for_session(req.code)
@@ -60,12 +85,21 @@ async def wechat_bind(req: WeChatBindRequest, db: AsyncSession = Depends(get_db)
         req.invite_code.strip().upper(),
         req.student_id.strip(),
     )
+    approved_target = None
     if activation_target is None:
-        raise HTTPException(status_code=400, detail="邀请码或学号无效，或账号已激活")
+        approved_target = await _find_approved_member_for_wechat_bind(
+            db,
+            req.invite_code.strip().upper(),
+            req.student_id.strip(),
+        )
+    if activation_target is None and approved_target is None:
+        raise HTTPException(status_code=400, detail="邀请码或学号无效")
 
-    user, class_id = activation_target
+    user, class_id = activation_target or approved_target
     if existing is not None and existing.id != user.id:
         raise HTTPException(status_code=400, detail="该微信已绑定其他账号")
+    if user.wechat_openid and user.wechat_openid != openid:
+        raise HTTPException(status_code=400, detail="该账号已绑定其他微信")
     if user.phone and user.phone != phone:
         raise HTTPException(status_code=400, detail="手机号与预留手机号不一致")
 
diff --git a/miniprogram/pages/bind/index.js b/miniprogram/pages/bind/index.js
index 92ba772..9a71d78 100644
--- a/miniprogram/pages/bind/index.js
+++ b/miniprogram/pages/bind/index.js
@@ -126,7 +126,8 @@ Page({
         phone_code: phoneCode
       });
       saveSession(res.token, res.user);
-      wx.switchTab({ url: "/pages/home/index" });
+      wx.showToast({ title: "绑定成功", icon: "success" });
+      setTimeout(() => wx.switchTab({ url: "/pages/home/index" }), 500);
     } catch (error) {
       wx.showToast({ title: error.message || "绑定失败", icon: "none" });
     } finally {
diff --git a/miniprogram/pages/bind/index.wxml b/miniprogram/pages/bind/index.wxml
index 0745103..44176fd 100644
--- a/miniprogram/pages/bind/index.wxml
+++ b/miniprogram/pages/bind/index.wxml
@@ -15,7 +15,7 @@
       <view wx:if="{{isWechatLogin}}" class="login-method">
         <view class="wechat-symbol">微</view>
         <view class="login-title">微信快捷登录</view>
-        <view class="login-copy">已绑定微信的同学可直接进入班级空间；未绑定账号会进入激活流程。</view>
+        <view class="login-copy">已绑定微信的同学可直接进入班级空间；未绑定微信的账号会进入绑定流程。</view>
         <button class="button login-primary" loading="{{loading}}" bindtap="loginWithWechatTap">使用微信登录</button>
       </view>
 
@@ -37,13 +37,13 @@
 
   <view wx:elif="{{isActivateMode}}" class="section">
     <view class="section-head">
-      <view class="section-title">激活账号</view>
+      <view class="section-title">绑定班级账号</view>
       <view class="section-action" bindtap="backToLogin">返回登录</view>
     </view>
     <view class="card">
       <view class="muted">说明</view>
       <view class="card-title">没有找到已绑定的微信账号</view>
-      <view class="muted">请用班级邀请码、学号和微信手机号激活你的班级账号。</view>
+      <view class="muted">请用班级邀请码、学号和微信手机号绑定你的班级账号；已在网站激活的账号也可以直接绑定并登录。</view>
     </view>
     <view class="card">
       <view class="muted">邀请码</view>