diff --git a/backend/config/settings.py b/backend/config/settings.py
index 6dcb7db..88b9e3f 100644
--- a/backend/config/settings.py
+++ b/backend/config/settings.py
@@ -109,7 +109,6 @@ if DB_HOST:
         'USER': os.environ.get('DB_USER', 'market'),
         'PASSWORD': os.environ.get('DB_PASSWORD', '123market'),
         'HOST': DB_HOST,
-
         'PORT': os.environ.get('DB_PORT', '5432'),
     }
 
@@ -123,7 +122,6 @@ if DB_HOST:
 #         'PASSWORD': os.environ.get('DB_PASSWORD', '123market'),
 #         'HOST': DB_HOST,
 #         'PORT': os.environ.get('DB_PORT', '6433'),
-
 #     }
 
 
diff --git a/backend/shop/sms_utils.py b/backend/shop/sms_utils.py
index e6b17aa..60420a8 100644
--- a/backend/shop/sms_utils.py
+++ b/backend/shop/sms_utils.py
@@ -96,4 +96,39 @@ def notify_user_order_shipped(order):
     
     print(f"准备发送用户发货通知: {order.phone_number}")
     #send_sms(order.phone_number, "SMS_501650557", params)
-    send_sms(order.phone_number, "SMS_501665569", params)
\ No newline at end of file
+    send_sms(order.phone_number, "SMS_501665569", params)
+
+def notify_user_activity_signup_success(order, signup):
+    """
+    通知用户活动报名成功 (支付成功后)
+    模板CODE: SMS_501990528
+    模板变量: user_nick, unit_name, time, address
+    """
+    if not order.phone_number:
+        return
+
+    # 1. user_nick
+    user_nick = order.customer_name
+    if order.wechat_user and order.wechat_user.nickname:
+        user_nick = order.wechat_user.nickname
+        
+    # 2. unit_name (Activity Title)
+    unit_name = signup.activity.title
+    
+    # 3. time
+    start_time = signup.activity.start_time
+    # Format time as YYYY-MM-DD HH:MM
+    time_str = start_time.strftime("%Y-%m-%d %H:%M") if start_time else "待定"
+    
+    # 4. address
+    address = signup.activity.location or "线上活动"
+    
+    params = {
+        "user_nick": user_nick or "用户",
+        "unit_name": unit_name,
+        "time": time_str,
+        "address": address
+    }
+    
+    print(f"准备发送活动报名成功通知: {order.phone_number}")
+    send_sms(order.phone_number, "SMS_501990528", params)
\ No newline at end of file
diff --git a/backend/shop/views.py b/backend/shop/views.py
index 6f75426..adee837 100644
--- a/backend/shop/views.py
+++ b/backend/shop/views.py
@@ -541,6 +541,14 @@ def payment_finish(request):
                                     signup.status = new_status
                                     signup.save()
                                     print(f"活动报名状态已更新: {signup.id} -> {new_status}")
+                                
+                                # Send Activity SMS
+                                try:
+                                    from .sms_utils import notify_user_activity_signup_success
+                                    notify_user_activity_signup_success(order, signup)
+                                except Exception as sms_e:
+                                    print(f"发送活动报名短信失败: {str(sms_e)}")
+
                             else:
                                 print(f"Error: No ActivitySignup found for paid order {order.id}")
 
@@ -644,6 +652,16 @@ def payment_finish(request):
                         import traceback
                         traceback.print_exc()
 
+                # 发送普通商品/课程购买的短信通知（排除活动报名，避免重复发送）
+                # 活动报名的短信已经在上面发送过了
+                if not (hasattr(order, 'activity') and order.activity):
+                    try:
+                        from .sms_utils import notify_admins_order_paid, notify_user_order_paid
+                        notify_admins_order_paid(order)
+                        notify_user_order_paid(order)
+                    except Exception as e:
+                        print(f"发送短信通知失败: {str(e)}")
+
             except Exception as e:
                 print(f"订单更新失败: {str(e)}")