diff --git a/python/paddle/distributed/fleet/fleet.py b/python/paddle/distributed/fleet/fleet.py
index de003916b7d255..9f6422b34a49e2 100755
--- a/python/paddle/distributed/fleet/fleet.py
+++ b/python/paddle/distributed/fleet/fleet.py
@@ -272,20 +272,7 @@ def init(
 
         self.strategy_compiler = StrategyCompiler()
 
-        if self._role_maker._is_non_distributed() and self._is_collective:
-            if paddle.framework.core.is_compiled_with_cuda():
-                gpus_num = paddle.framework.core.get_cuda_device_count()
-                if gpus_num != 1:
-                    raise ValueError(
-                        "CUDA_VISIBLE_DEVICES shoule be set only 1 card if you use `python` to launch fleet program."
-                    )
-
         if in_dynamic_mode():
-            if self.worker_num() == 1:
-                # if worker_num is 1, should construct default topology & hcg
-                self._topology = tp.CommunicateTopology()
-                self._hcg = tp.HybridCommunicateGroup(self._topology)
-                return
             if parallel_helper._is_parallel_ctx_initialized():
                 logger.warning(
                     "The dygraph parallel environment has been initialized."
diff --git a/python/paddle/distributed/fleet/model.py b/python/paddle/distributed/fleet/model.py
index af230e28aca6f8..e7cd0b33e9d16d 100755
--- a/python/paddle/distributed/fleet/model.py
+++ b/python/paddle/distributed/fleet/model.py
@@ -85,7 +85,7 @@ def forward(self, x):
     fleet_env = fleet.fleet
 
     assert model is not None, "model should not be None"
-    if fleet_env.worker_num() <= 1:
+    if paddle.distributed.get_world_size() <= 1:
         return model
 
     amp_enable = False
diff --git a/python/paddle/distributed/launch/controllers/collective.py b/python/paddle/distributed/launch/controllers/collective.py
index 6ab47b8ba54da0..bb938dd5c1f1d8 100644
--- a/python/paddle/distributed/launch/controllers/collective.py
+++ b/python/paddle/distributed/launch/controllers/collective.py
@@ -120,12 +120,14 @@ def _build_pod_with_args(self):
                 "PADDLE_LOCAL_RANK": f"{i}",
                 "PADDLE_NNODES": f"{len(ips)}",
                 # compatible env
-                "PADDLE_TRAINER_ENDPOINTS": ",".join(job_endpoints),
                 "PADDLE_CURRENT_ENDPOINT": job_endpoints[i + rank_offset],
                 "PADDLE_TRAINER_ID": f"{i + rank_offset}",
                 "PADDLE_TRAINERS_NUM": f"{len(job_endpoints)}",
                 "PADDLE_RANK_IN_NODE": str(i),
             }
+            if len(",".join(job_endpoints)) < 120 * 1024:
+                e.update({"PADDLE_TRAINER_ENDPOINTS": ",".join(job_endpoints)})
+
             if self._tuner_run_mode is not None:
                 e.update(
                     {
@@ -213,12 +215,14 @@ def _build_pod_with_master(self):
                 "PADDLE_LOCAL_RANK": f"{i}",
                 "PADDLE_NNODES": f"{self.job.replicas}",
                 # compatible env
-                "PADDLE_TRAINER_ENDPOINTS": ",".join(job_endpoints),
                 "PADDLE_CURRENT_ENDPOINT": endpoints[i],
                 "PADDLE_TRAINER_ID": f"{i + rank_offset}",
                 "PADDLE_TRAINERS_NUM": f"{global_size}",
                 "PADDLE_RANK_IN_NODE": str(i),
             }
+            if len(",".join(job_endpoints)) < 120 * 1024:
+                e.update({"PADDLE_TRAINER_ENDPOINTS": ",".join(job_endpoints)})
+
             if self._tuner_run_mode is not None:
                 e.update(
                     {
diff --git a/python/paddle/distributed/parallel.py b/python/paddle/distributed/parallel.py
index ebbcbdf1c7c875..1d5d07f01cbd69 100644
--- a/python/paddle/distributed/parallel.py
+++ b/python/paddle/distributed/parallel.py
@@ -38,7 +38,11 @@
     _set_group_map_by_name,
     _valid_backend_list,
 )
-from paddle.distributed.communication.group import _add_new_group
+from paddle.distributed.communication.group import (
+    _add_new_group,
+    _get_global_group,
+    is_initialized,
+)
 from paddle.distributed.fleet.base.private_helper_function import (  # noqa: F401
     wait_server_ready,
 )
@@ -1017,7 +1021,6 @@ def train():
     _check_var_exists("PADDLE_TRAINER_ID")
     _check_var_exists("PADDLE_CURRENT_ENDPOINT")
     _check_var_exists("PADDLE_TRAINERS_NUM")
-    _check_var_exists("PADDLE_TRAINER_ENDPOINTS")
 
     # NOTE(chenweihang): [ why config global place here? ]
     # the dygraph mode will be set to default mode,
@@ -1242,6 +1245,10 @@ def get_world_size(group=None):
             print("The world_size is %d" % dist.get_world_size())
             # The world_size is 1
     """
+    if in_dynamic_mode() and (group is None):
+        if is_initialized():
+            group = _get_global_group()
+
     if in_dynamic_mode() and group:
         return group.world_size
 
diff --git a/test/legacy_test/test_spawn_and_init_parallel_env.py b/test/legacy_test/test_spawn_and_init_parallel_env.py
index a9e3e7f8f672d8..290d48d72c9113 100644
--- a/test/legacy_test/test_spawn_and_init_parallel_env.py
+++ b/test/legacy_test/test_spawn_and_init_parallel_env.py
@@ -37,7 +37,7 @@ class TestInitParallelEnv(unittest.TestCase):
     def test_check_env_failed(self):
         os.environ['FLAGS_selected_gpus'] = '0'
         os.environ['PADDLE_TRAINER_ID'] = '0'
-        os.environ['PADDLE_CURRENT_ENDPOINT'] = '127.0.0.1:6170'
+        # os.environ['PADDLE_CURRENT_ENDPOINT'] = '127.0.0.1:6170'
         os.environ['PADDLE_TRAINERS_NUM'] = '2'
         with self.assertRaises(ValueError):
             dist.init_parallel_env()