diff --git a/src/api/project_routes.py b/src/api/project_routes.py
index 1013192..89866a1 100644
--- a/src/api/project_routes.py
+++ b/src/api/project_routes.py
@@ -80,3 +80,38 @@ async def update_project(project_id: str, body: Dict[str, Any]):
     if not reg.update_project(project_id, **updates):
         raise HTTPException(404, f"Project not found: {project_id}")
     return {"ok": True}
+
+
+@router.post("/{project_id}/tasks/{task_id}/move")
+async def move_task(project_id: str, task_id: str, body: Dict[str, Any]):
+    """移动任务到另一个项目"""
+    target_project = body.get("target_project_id")
+    if not target_project:
+        raise HTTPException(422, "Missing target_project_id")
+
+    reg = _registry()
+    # 验证目标项目存在
+    target = reg.get_project(target_project)
+    if not target or target.get("status") not in ("active",):
+        raise HTTPException(404, f"Target project not found: {target_project}")
+
+    # 从源项目读任务
+    from src.blackboard.db import Blackboard
+    src_bb = Blackboard(Path(reg.root) / project_id / "blackboard.db")
+    task = src_bb.get_task(task_id)
+    if not task:
+        raise HTTPException(404, f"Task not found: {task_id}")
+
+    # 写入目标项目
+    tgt_bb = Blackboard(Path(reg.root) / target_project / "blackboard.db")
+    task_data = {k: getattr(task, k) for k in [
+        "id", "title", "description", "status", "assignee", "assigned_by",
+        "priority", "task_type", "risk_level", "parent_task", "stage",
+        "depends_on", "stages_json",
+    ] if getattr(task, k, None) is not None}
+    tgt_bb.create_task_from_dict(task_data)
+
+    # 从源项目删除（归档式删除）
+    src_bb.update_task_status(task_id, "cancelled")
+
+    return {"ok": True, "moved_to": target_project}