diff --git a/python/paddle/distributed/auto_tuner/recorder.py b/python/paddle/distributed/auto_tuner/recorder.py
index 69c53001832625..006093a348d4a4 100644
--- a/python/paddle/distributed/auto_tuner/recorder.py
+++ b/python/paddle/distributed/auto_tuner/recorder.py
@@ -51,33 +51,53 @@ def sort_metric(self, direction, metric_name) -> None:
                 reverse=False,
             )
 
-    def get_best(self, metric, direction, mode=None) -> Tuple[dict, bool]:
+    def get_best(
+        self, metric, direction, buffer=None, max_mem_usage=None
+    ) -> Tuple[dict, bool]:
         self.sort_metric(direction=direction, metric_name=metric)
         if len(self.history) == 0:
-            return (self.history[0], True)
-        if mode == "SFT" or mode == "LoRA" or mode == "Pretrain":
-            best_cfg = self.history[0]
-            if (
-                isinstance(best_cfg["max_mem_usage"], str)
-                or best_cfg["time"] == -1
-            ):
-                return (best_cfg, True)
-            first_few = 0
+            return (None, True)
+
+        best_cfg = self.history[0]
+        if isinstance(best_cfg["max_mem_usage"], str) or best_cfg["time"] == -1:
+            return (best_cfg, True)
+
+        if buffer is not None:
+            if buffer < 0:
+                raise ValueError("The buffer should be not less than 0.")
+            assert (
+                max_mem_usage is not None
+            ), "max_mem_usage cannot be None when buffer is greater than 0."
+            if max_mem_usage <= 0:
+                raise ValueError("max_mem_usage should be greater than 0.")
+
             for cfg in self.history:
+                if (
+                    not best_cfg["max_mem_usage"]
+                    and cfg["max_mem_usage"]
+                    and not isinstance(cfg["max_mem_usage"], str)
+                    and cfg["time"] != -1
+                ):
+                    best_cfg = cfg
+                    continue
+
                 if (
                     not isinstance(cfg["max_mem_usage"], str)
+                    and cfg["max_mem_usage"]
                     and cfg["max_mem_usage"] < best_cfg["max_mem_usage"]
                     and cfg["time"] != -1
                 ):
                     best_cfg = cfg
-                first_few += 1
-                if first_few >= 3:
+
+                if (
+                    not isinstance(cfg["max_mem_usage"], str)
+                    and cfg["max_mem_usage"]
+                    and cfg["max_mem_usage"] < max_mem_usage - buffer
+                    and cfg["time"] != -1
+                ):
                     break
             return (best_cfg, False)
-        if isinstance(self.history[0]["max_mem_usage"], str) or (
-            "time" in self.history[0] and self.history[0]["time"] == -1
-        ):
-            return (self.history[0], True)
+
         return (self.history[0], False)
 
     def _store_history_impl(self, data, path="./history.csv"):
diff --git a/python/paddle/distributed/launch/main.py b/python/paddle/distributed/launch/main.py
index f5c0f8d7f1671a..80f082260d1109 100644
--- a/python/paddle/distributed/launch/main.py
+++ b/python/paddle/distributed/launch/main.py
@@ -436,6 +436,10 @@ def launch():
         # max_search_time
         max_search_time = tuner_cfg.get("max_search_time", None)
 
+        # buffer and memory
+        buffer = tuner_cfg.get("buffer", None)
+        max_mem_usage = tuner_cfg.get("max_mem_usage", None)
+
         is_first_task = True
         # build history recorder
         recorder = HistoryRecorder(tuner_cfg)
@@ -681,6 +685,8 @@ def launch():
                 cur_best_cfgs, err = recorder.get_best(
                     metric=tuner_cfg['metric_cfg']['name'],
                     direction=tuner_cfg['metric_cfg']['OptimizationDirection'],
+                    buffer=buffer,
+                    max_mem_usage=max_mem_usage,
                 )
                 if not err:
                     ctx.logger.info(f"Current best config: {cur_best_cfgs}")
@@ -781,6 +787,8 @@ def launch():
                         direction=tuner_cfg['metric_cfg'][
                             'OptimizationDirection'
                         ],
+                        buffer=buffer,
+                        max_mem_usage=max_mem_usage,
                     )
                     if not err:
                         ctx.logger.info(f"Current best config: {cur_best_cfgs}")
@@ -1158,7 +1166,8 @@ def launch():
             cur_best_cfgs, err = recorder.get_best(
                 metric=tuner_cfg['metric_cfg']['name'],
                 direction=tuner_cfg['metric_cfg']['OptimizationDirection'],
-                mode=mode,
+                buffer=buffer,
+                max_mem_usage=max_mem_usage,
             )
             if not err:
                 ctx.logger.info(f"Current best config: {cur_best_cfgs}")
@@ -1206,7 +1215,8 @@ def launch():
                 best_cfg, err = recorder.get_best(
                     metric=tuner_cfg['metric_cfg']['name'],
                     direction=tuner_cfg['metric_cfg']['OptimizationDirection'],
-                    mode=mode,
+                    buffer=buffer,
+                    max_mem_usage=max_mem_usage,
                 )
                 if err:
                     raise ValueError(
@@ -1232,7 +1242,8 @@ def launch():
             best_cfg, err = recorder.get_best(
                 metric=tuner_cfg['metric_cfg']['name'],
                 direction=tuner_cfg['metric_cfg']['OptimizationDirection'],
-                mode=mode,
+                buffer=buffer,
+                max_mem_usage=max_mem_usage,
             )
             if err:
                 raise ValueError(
@@ -1255,9 +1266,13 @@ def launch():
         ctx.args.job_id = "best_cfg"
         ctx.logger.info(f"Launch best cfg: {best_cfg}")
         logger.info(f"Launch best cfg: {best_cfg}")
-        ctx.args.log_dir = ctx.args.log_dir = os.path.join(
-            os.path.dirname(ctx.args.auto_tuner_json), "best_cfg"
-        )
+
+        if tuner_cfg.get("best_cfg_dir", None):
+            ctx.args.log_dir = tuner_cfg["best_cfg_dir"]
+        else:
+            ctx.args.log_dir = os.path.join(
+                os.path.dirname(ctx.args.auto_tuner_json), "best_cfg"
+            )
         # run best cfg
         c = controllers.init(ctx)
         c.run()