diff --git a/main.py b/main.py
index d4e5113..c588cb9 100644
--- a/main.py
+++ b/main.py
@@ -686,17 +686,43 @@ async def import_programs(
 async def update_program(program_sn: str, program: ProgramUpdate):
     with get_db(write=True) as conn:
         cursor = conn.cursor()
-        cursor.execute('SELECT sn FROM programs WHERE sn = ?', (program_sn,))
-        if not cursor.fetchone():
-            raise HTTPException(status_code=404, detail='节目不存在')
+        # 获取当前节目的信息（特别是原 batch_id 和 order_num）
         cursor.execute(
-            'UPDATE programs SET name = ?, unit = ?, performer = ?, category = ?, batch_id = ? WHERE sn = ?',
+            'SELECT batch_id, order_num FROM programs WHERE sn = ?', (program_sn,)
+        )
+        old = cursor.fetchone()
+        if not old:
+            raise HTTPException(status_code=404, detail='节目不存在')
+
+        new_batch_id = program.batch_id
+
+        # 如果批次发生了变更
+        if old['batch_id'] != new_batch_id:
+            # 获取目标批次的最大 order_num
+            cursor.execute(
+                'SELECT COALESCE(MAX(order_num), 0) FROM programs WHERE batch_id = ?',
+                (new_batch_id,),
+            )
+            max_order = cursor.fetchone()[0]
+            new_order_num = max_order + 1  # 新节目放到末尾
+        else:
+            # 批次未变，保留原 order_num
+            new_order_num = old['order_num']
+
+        # 更新节目信息，包括 batch_id 和 order_num
+        cursor.execute(
+            """
+            UPDATE programs
+            SET name = ?, unit = ?, performer = ?, category = ?, batch_id = ?, order_num = ?
+            WHERE sn = ?
+            """,
             (
                 program.name,
                 program.unit,
                 program.performer,
                 program.category,
-                program.batch_id,
+                new_batch_id,
+                new_order_num,
                 program_sn,
             ),
         )