diff --git a/src/moldinsight/services/processing_service.py b/src/moldinsight/services/processing_service.py
index 4bc11eb..463d973 100644
--- a/src/moldinsight/services/processing_service.py
+++ b/src/moldinsight/services/processing_service.py
@@ -136,7 +136,8 @@ class ProcessingService:
                 try:
                     await asyncio.wait_for(
                         self.process_file_core(
-                            task_id, file_path, stp_file_id, db_session, process_params
+                            task_id, file_path, stp_file_id, db_session, process_params,
+                            timeout_seconds=timeout_seconds,
                         ),
                         timeout_seconds,
                     )
@@ -178,8 +179,13 @@ class ProcessingService:
         stp_file_id: int,
         db_session: AsyncSession,
         process_params: Optional[Dict[str, Any]] = None,
+        timeout_seconds: float = 300,
     ):
-        """核心处理逻辑"""
+        """核心处理逻辑
+
+        timeout_seconds：OCC 子进程各步骤的超时，由调用方按文件大小计算
+        （曾因重构拆方法时漏传此参数，4 处引用 NameError，解析必挂）。
+        """
 
         try:
             logger.info(f"开始处理文件并生成模具型腔: {file_path}")