diff --git a/src/blackboard/operations.py b/src/blackboard/operations.py
index 18e8135..2711aef 100644
--- a/src/blackboard/operations.py
+++ b/src/blackboard/operations.py
@@ -175,7 +175,7 @@ class Blackboard:
 
     def list_tasks(self, status: Optional[str] = None,
                    assignee: Optional[str] = None,
-                   card_id: Optional[str] = None) -> List[Task]:
+                   parent_task: Optional[str] = None) -> List[Task]:
         """列出任务"""
         conn = self._conn()
         try:
@@ -188,9 +188,9 @@ class Blackboard:
             if assignee:
                 conditions.append("assignee=?")
                 params.append(assignee)
-            if card_id:
-                conditions.append("card_id=?")
-                params.append(card_id)
+            if parent_task is not None:
+                conditions.append("parent_task=?")
+                params.append(parent_task)
             if conditions:
                 query += " WHERE " + " AND ".join(conditions)
             query += " ORDER BY priority ASC, created_at ASC"