diff --git a/sanguo_factor/batch_eval.py b/sanguo_factor/batch_eval.py
index 456eab9..d522c94 100644
--- a/sanguo_factor/batch_eval.py
+++ b/sanguo_factor/batch_eval.py
@@ -116,7 +116,8 @@ def run_batch_eval(
             errors.append(name)
         buffer.append(row)
         done += 1
-        if len(buffer) >= 20 or done == len(factor_names):
+        # 逐因子即存:容器重启风暴下单次最多丢在途 1 因子(buffer=20 曾丢 6 个)
+        if len(buffer) >= 1 or done == len(factor_names):
             eval_store.save_results(eval_db, run_id, buffer)
             buffer = []
         if progress_cb: