diff --git a/src/chat/express/expression_learner.py b/src/chat/express/expression_learner.py
index 4ca25d2c4..f219bcac5 100644
--- a/src/chat/express/expression_learner.py
+++ b/src/chat/express/expression_learner.py
@@ -232,7 +232,6 @@ class ExpressionLearner:
             logger.error(f"为聊天流 {self.chat_name} 触发学习失败: {e}")
             return False
 
-    @cached(ttl=600, key_prefix="chat_expressions")
     async def get_expression_by_chat_id(self) -> tuple[list[dict[str, float]], list[dict[str, float]]]:
         """
         获取指定chat_id的style和grammar表达方式（带10分钟缓存）
@@ -240,12 +239,19 @@ class ExpressionLearner:
         
         优化: 使用CRUD和缓存，减少数据库访问
         """
+        # 使用静态方法以正确处理缓存键
+        return await self._get_expressions_by_chat_id_cached(self.chat_id)
+    
+    @staticmethod
+    @cached(ttl=600, key_prefix="chat_expressions")
+    async def _get_expressions_by_chat_id_cached(chat_id: str) -> tuple[list[dict[str, float]], list[dict[str, float]]]:
+        """内部方法：从数据库获取表达方式（带缓存）"""
         learnt_style_expressions = []
         learnt_grammar_expressions = []
 
         # 使用CRUD查询
         crud = CRUDBase(Expression)
-        all_expressions = await crud.get_all_by(chat_id=self.chat_id)
+        all_expressions = await crud.get_all_by(chat_id=chat_id)
 
         for expr in all_expressions:
                 # 确保create_date存在，如果不存在则使用last_active_time
@@ -256,7 +262,7 @@ class ExpressionLearner:
                     "style": expr.style,
                     "count": expr.count,
                     "last_active_time": expr.last_active_time,
-                    "source_id": self.chat_id,
+                    "source_id": chat_id,
                     "type": expr.type,
                     "create_date": create_date,
                 }
diff --git a/src/chat/message_receive/chat_stream.py b/src/chat/message_receive/chat_stream.py
index 9ca750fef..b20892623 100644
--- a/src/chat/message_receive/chat_stream.py
+++ b/src/chat/message_receive/chat_stream.py
@@ -450,8 +450,8 @@ class ChatManager:
                 defaults={
                     "user_platform": user_info.platform if user_info else platform,
                     "user_id": user_info.user_id if user_info else "",
-                    "user_nickname": user_info.nickname if user_info else "",
-                    "user_cardname": user_info.cardname if user_info else "",
+                    "user_nickname": user_info.user_nickname if user_info else "",
+                    "user_cardname": user_info.user_cardname if user_info else "",
                     "group_platform": group_info.platform if group_info else None,
                     "group_id": group_info.group_id if group_info else None,
                     "group_name": group_info.group_name if group_info else None,
diff --git a/src/person_info/person_info.py b/src/person_info/person_info.py
index 793c7f498..931b43720 100644
--- a/src/person_info/person_info.py
+++ b/src/person_info/person_info.py
@@ -539,14 +539,9 @@ class PersonInfoManager:
                 if record:
                     await crud.delete(record.id)
                     
-                    # 清除相关缓存
-                    from src.common.database.optimization.cache_manager import get_cache
-                    from src.common.database.utils.decorators import generate_cache_key
-                    cache = await get_cache()
-                    
-                    # 清除所有相关的person缓存
-                    await cache.delete(generate_cache_key("person_known", p_id))
-                    await cache.delete(generate_cache_key("person_field", p_id))
+                    # 注意: 删除操作很少发生,缓存会在TTL过期后自动清除
+                    # 无法从person_id反向得到platform和user_id,因此无法精确清除缓存
+                    # 删除后的查询仍会返回正确结果(None/False)
                     return 1
                 return 0
             except Exception as e: