diff --git a/app/services/wechat_service.py b/app/services/wechat_service.py
index c35663e..968dcfe 100644
--- a/app/services/wechat_service.py
+++ b/app/services/wechat_service.py
@@ -260,7 +260,7 @@ class WeChatService:
                     "task_id": alarm_id,
                     "source": {
                         "desc": "AI安防告警 - 处理中",
-                        "desc_color": 0,
+                        "desc_color": 1,
                     },
                     "main_title": {
                         "title": f"已接单 - {operator_name}" if operator_name else "已接单",
@@ -305,7 +305,12 @@ class WeChatService:
         action: str,
         operator_name: str = "",
     ) -> bool:
-        """更新卡片到终态（按钮变灰 + 显示最终结果）"""
+        """
+        更新卡片到终态（仅替换按钮文案，不重绘整张卡片）
+
+        使用 button.replace_name 方式更新，原卡片内容保持不变，
+        按钮变为不可点击状态并显示处理结果文案。
+        """
         if not self._enabled:
             return False
 
@@ -324,20 +329,8 @@ class WeChatService:
                 "userids": user_ids,
                 "agentid": self.agent_id_int,
                 "response_code": response_code,
-                "template_card": {
-                    "card_type": "button_interaction",
-                    "task_id": alarm_id,
-                    "main_title": {
-                        "title": replace_text,
-                    },
-                    "sub_title_text": f"操作人：{operator_name}" if operator_name else "",
-                    "button_list": [
-                        {
-                            "text": replace_text,
-                            "style": 3,
-                            "key": f"done_{alarm_id}",
-                        },
-                    ],
+                "button": {
+                    "replace_name": replace_text,
                 },
             }