diff --git a/rdagent/app/qlib_rd_loop/model_w_sc.py b/rdagent/app/qlib_rd_loop/model_w_sc.py
index aa6c7b31..c5fca4c3 100644
--- a/rdagent/app/qlib_rd_loop/model_w_sc.py
+++ b/rdagent/app/qlib_rd_loop/model_w_sc.py
@@ -67,20 +67,20 @@ class ModelLoop(LoopBase, metaclass=LoopMeta):
         self.trace.hist.append((prev_out["propose"],prev_out["running"] , feedback))
 
 
-def main(path=None):
+def main(path=None, step_n=None):
     """
     You can continue running session by
 
     .. code-block:: python
 
-        dotenv run -- python rdagent/app/qlib_rd_loop/model_w_sc.py $LOG_PATH/__session__/1/0_propose
+        dotenv run -- python rdagent/app/qlib_rd_loop/model_w_sc.py $LOG_PATH/__session__/1/0_propose  --step_n 1   # `step_n` is a optional paramter
 
     """
     if path is None:
         model_loop = ModelLoop()
     else:
         model_loop = ModelLoop.load(path)
-    model_loop.run()
+    model_loop.run(step_n=step_n)
 
 
 if __name__ == "__main__":
diff --git a/rdagent/utils/workflow.py b/rdagent/utils/workflow.py
index ee37d989..5a8b1dda 100644
--- a/rdagent/utils/workflow.py
+++ b/rdagent/utils/workflow.py
@@ -51,9 +51,22 @@ class LoopBase:
         self.loop_trace = defaultdict(list[LoopTrace])  # the key is the number of loop
         self.session_folder = logger.log_trace_path / "__session__"
 
-    def run(self):
+    def run(self, step_n: int | None = None):
+        """
+
+        Parameters
+        ----------
+        step_n : int | None
+            How many steps to run;
+            `None` indicates to run forever until error or KeyboardInterrupt
+        """
         with tqdm(total=len(self.steps), desc="Workflow Progress", unit="step") as pbar:
             while True:
+                if step_n is not None:
+                    if step_n <= 0:
+                        break
+                    step_n -= 1
+
                 li, si = self.loop_idx, self.step_idx
 
                 start = datetime.datetime.now(datetime.timezone.utc)