diff --git a/src/chongming_worker/decorators.py b/src/chongming_worker/decorators.py
index d943cc2..90ba9bb 100644
--- a/src/chongming_worker/decorators.py
+++ b/src/chongming_worker/decorators.py
@@ -203,7 +203,12 @@ class RPCMethod:
             return payload
         try:
             validated = req_model(**payload)
-            return validated.model_dump()
+            result = validated.model_dump()
+            # 保留原始 payload 中不属于请求模型的额外字段（如 _method、user_info 等）
+            for k, v in payload.items():
+                if k not in result:
+                    result[k] = v
+            return result
         except ValidationError as e:
             raise ValueError(f"请求参数校验失败: {e.errors()}")