diff --git a/data_platform/backfill_15min_baostock.py b/data_platform/backfill_15min_baostock.py
index 6e2577dd..8bd88e75 100644
--- a/data_platform/backfill_15min_baostock.py
+++ b/data_platform/backfill_15min_baostock.py
@@ -265,8 +265,20 @@ def main():
 
     stats = {"ok": 0, "skipped": 0, "failed": 0, "rows": 0}
     t_start = time.time()
+    RELOGIN_EVERY = 400  # 每400只重新登录BaoStock，防止连接断开
 
     for i, code in enumerate(todo):
+        # 定期重新登录保持连接
+        if i > 0 and i % RELOGIN_EVERY == 0:
+            bs.logout()
+            time.sleep(2)
+            lg = bs.login()
+            if lg.error_code != "0":
+                logger.error("BaoStock重连失败: %s，等待30秒", lg.error_msg)
+                time.sleep(30)
+                lg = bs.login()
+            logger.info("BaoStock重连 @ %d/%d", i, len(todo))
+
         try:
             status, total_rows = backfill_one(code, start_date, end_date, args.force)
         except Exception as e: