diff --git a/backend/community/admin.py b/backend/community/admin.py
index 37accba..8bafdd8 100644
--- a/backend/community/admin.py
+++ b/backend/community/admin.py
@@ -98,9 +98,14 @@ class ActivitySignupAdmin(ModelAdmin):
             "pending": "warning",
             "confirmed": "success",
             "cancelled": "danger",
+            "unpaid": "secondary",
         }
     )
     def status_label(self, obj):
+        # Auto sync with order status on display
+        if obj.check_payment_status():
+            # If status changed, return new status
+            return obj.status
         return obj.status
 
     @display(description="关联订单")
diff --git a/backend/community/models.py b/backend/community/models.py
index e2bcbc2..8c42676 100644
--- a/backend/community/models.py
+++ b/backend/community/models.py
@@ -95,6 +95,17 @@ class ActivitySignup(models.Model):
     def __str__(self):
         return f"{self.user.nickname} - {self.activity.title}"
 
+    def check_payment_status(self):
+        """
+        检查并同步关联订单的支付状态
+        """
+        if self.status == 'unpaid' and self.order:
+            if self.order.status == 'paid':
+                self.status = 'confirmed' if self.activity.auto_confirm else 'pending'
+                self.save()
+                return True
+        return False
+
     class Meta:
         verbose_name = "活动报名"
         verbose_name_plural = "活动报名管理"
diff --git a/backend/community/views.py b/backend/community/views.py
index 81c5b55..b287ee5 100644
--- a/backend/community/views.py
+++ b/backend/community/views.py
@@ -197,6 +197,11 @@ class ActivityViewSet(viewsets.ReadOnlyModelViewSet):
         if not user:
             return Response({'error': '请先登录'}, status=401)
         signups = ActivitySignup.objects.filter(user=user).order_by('-signup_time')
+        
+        # Sync payment status
+        for signup in signups:
+            signup.check_payment_status()
+            
         serializer = ActivitySignupSerializer(signups, many=True)
         return Response(serializer.data)
 
diff --git a/backend/shop/views.py b/backend/shop/views.py
index 2c504b2..6f75426 100644
--- a/backend/shop/views.py
+++ b/backend/shop/views.py
@@ -532,10 +532,15 @@ def payment_finish(request):
 
                             if signup:
                                 # Determine status based on activity setting
-                                new_status = 'confirmed' if signup.activity.auto_confirm else 'pending'
-                                signup.status = new_status
-                                signup.save()
-                                print(f"活动报名状态已更新: {signup.id} -> {new_status}")
+                                # Use the model method if available, otherwise manual logic
+                                if hasattr(signup, 'check_payment_status'):
+                                    signup.check_payment_status()
+                                    print(f"活动报名状态已更新(check_payment_status): {signup.id} -> {signup.status}")
+                                else:
+                                    new_status = 'confirmed' if signup.activity.auto_confirm else 'pending'
+                                    signup.status = new_status
+                                    signup.save()
+                                    print(f"活动报名状态已更新: {signup.id} -> {new_status}")
                             else:
                                 print(f"Error: No ActivitySignup found for paid order {order.id}")