diff --git a/dlrover/python/elastic_agent/torch/training.py b/dlrover/python/elastic_agent/torch/training.py
index ad85fdcc2..de146ce67 100644
--- a/dlrover/python/elastic_agent/torch/training.py
+++ b/dlrover/python/elastic_agent/torch/training.py
@@ -104,6 +104,11 @@ class ElasticLaunchConfig(LaunchConfig):
     auto_tunning: bool = False
     exclude_straggler: bool = False
 
+    def set_node_unit(self, node_unit):
+        """Set the number unint of ndoes."""
+        self.node_unit = node_unit
+        self.rdzv_configs["node_unit"] = node_unit
+
 
 @dataclass
 class ProcessError:
diff --git a/dlrover/python/tests/test_elastic_training_agent.py b/dlrover/python/tests/test_elastic_training_agent.py
index 6f7077852..08a94fceb 100644
--- a/dlrover/python/tests/test_elastic_training_agent.py
+++ b/dlrover/python/tests/test_elastic_training_agent.py
@@ -52,6 +52,7 @@ def setUp(self) -> None:
             run_id="test",
         )
         self.config = ElasticLaunchConfig(**launch_config.__dict__)
+        self.config.set_node_unit(2)
         rdzv_parameters = RendezvousParameters(
             backend=self.config.rdzv_backend,
             endpoint=self.config.rdzv_endpoint,
@@ -90,6 +91,10 @@ def setUp(self) -> None:
     def addCleanup(self):
         self._master.stop()
 
+    def test_node_unit(self):
+        node_unit = int(self.rdzv_handler._rdzv_params.get("node_unit", "1"))
+        self.assertEqual(node_unit, 2)
+
     def test_rank0_rendzevous(self):
         node_id = 0
         agent = ElasticTrainingAgent(
diff --git a/dlrover/trainer/torch/elastic_run.py b/dlrover/trainer/torch/elastic_run.py
index 485c8918b..a9f2da75c 100644
--- a/dlrover/trainer/torch/elastic_run.py
+++ b/dlrover/trainer/torch/elastic_run.py
@@ -231,11 +231,11 @@ def _elastic_config_from_args(
     config, cmd, cmd_args = config_from_args(args)
     elastic_config = ElasticLaunchConfig(**config.__dict__)
     elastic_config.network_check = getattr(args, "network_check", False)
-    elastic_config.node_unit = getattr(args, "node_unit", 1)
     elastic_config.auto_tunning = getattr(args, "auto_tunning", False)
     elastic_config.exclude_straggler = getattr(
         args, "exclude_straggler", False
     )
+    elastic_config.set_node_unit(getattr(args, "node_unit", 1))
     return elastic_config, cmd, cmd_args