diff --git a/torchacc/dist/distributed_parallel.py b/torchacc/dist/distributed_parallel.py
index 89a4130..6b39fb4 100644
--- a/torchacc/dist/distributed_parallel.py
+++ b/torchacc/dist/distributed_parallel.py
@@ -14,19 +14,18 @@ class DistributedParallel(ParallelModule):
 
     def __init__(self, model: torch.nn.Module, config: Config, **kwargs):
         super().__init__(model, config, **kwargs)
-
-        self.model = None
+        self._module = None
         if self.has_pp:
-            self.model = PipelineParallel(model, self.config, **kwargs)
+            self._module = PipelineParallel(model, self.config, **kwargs)
 
         fsdp_wrapper = SpmdFullyShardedDataParallel if self.spmd_fsdp else FullyShardedDataParallel
         if self.has_fsdp:
-            if self.model is None:
-                self.model = fsdp_wrapper(model, self.config, **kwargs)
+            if self._module is None:
+                self._module = fsdp_wrapper(model, self.config, **kwargs)
             else:
-                model = self.model._get_underlay_model()
+                model = self._module._get_underlay_model()
                 model = fsdp_wrapper(model, self.config, **kwargs)
-                self.model._update_underlay_model(model)
+                self._module._update_underlay_model(model)
 
         need_wrap_dp = False
         if config.is_eager_backend():
@@ -35,32 +34,32 @@ def __init__(self, model: torch.nn.Module, config: Config, **kwargs):
             need_wrap_dp = self.has_dp and not self.has_tp
 
         if need_wrap_dp:
-            if self.model is None:
-                self.model = DataParallel(model, self.config, **kwargs)
+            if self._module is None:
+                self._module = DataParallel(model, self.config, **kwargs)
             else:
-                model = self.model._get_underlay_model()
-                model = DataParallel(model, self.config, **kwargs)
-                self.model._update_underlay_model(model)
+                module = self._module._get_underlay_model()
+                module = DataParallel(model, self.config, **kwargs)
+                self._module._update_underlay_model(module)
 
-        if self.model is None:
-            self.model = model
+        if self._module is None:
+            self._module = module
 
     def _get_underlay_model(self):
-        if isinstance(self.model, ParallelModule):
-            return self.model._get_underlay_model()
-        return self.model
+        if isinstance(self._module, ParallelModule):
+            return self._module._get_underlay_model()
+        return self._module
 
-    def _update_underlay_model(self, model: torch.nn.Module):
-        if isinstance(self.model, ParallelModule):
-            self.model._update_underlay_model(model)
+    def _update_underlay_model(self, module: torch.nn.Module):
+        if isinstance(self._module, ParallelModule):
+            self._module._update_underlay_model(module)
         else:
-            self.model = model
+            self._module = module
 
     def clip_grad_norm_(self, max_grad_norm):
-        if hasattr(self.model, "clip_grad_norm_"):
-            self.model.clip_grad_norm_(max_grad_norm)
+        if hasattr(self._module, "clip_grad_norm_"):
+            self._module.clip_grad_norm_(max_grad_norm)
         else:
-            torch.nn.utils.clip_grad_norm_(self.model.parameters(),
+            torch.nn.utils.clip_grad_norm_(self._module.parameters(),
                                            max_grad_norm)
 
     def forward(self, *args, output_fn=None, **kwargs):
@@ -69,11 +68,12 @@ def forward(self, *args, output_fn=None, **kwargs):
                 "output_fn is only supported for pipeline parallel")
         if output_fn:
             kwargs["output_fn"] = output_fn
-        return self.model(*args, **kwargs)
+        return self._module(*args, **kwargs)
 
     def forward_backward(self, *args, output_fn=None, **kwargs):
         if not self.has_pp:
             raise NotImplementedError(
                 "forward_backward is only supported for pipeline parallel.")
-        assert isinstance(self.model, PipelineParallel)
-        return self.model.forward_backward(*args, output_fn=output_fn, **kwargs)
+        assert isinstance(self._module, PipelineParallel)
+        return self._module.forward_backward(
+            *args, output_fn=output_fn, **kwargs)
diff --git a/torchacc/dist/parallel_module.py b/torchacc/dist/parallel_module.py
index caa33c5..e6cb00f 100644
--- a/torchacc/dist/parallel_module.py
+++ b/torchacc/dist/parallel_module.py
@@ -67,3 +67,9 @@ def forward_backward(self, *args, output_fn=None, **kwargs):
         """
         raise NotImplementedError(
             "forward_backward is only supported for pipeline parallel.")
+
+    def __getattr__(self, name):
+        try:
+            return super().__getattr__(name)
+        except AttributeError:
+            return getattr(self._get_underlay_model(), name)