diff --git a/colossalai/amp/__init__.py b/colossalai/amp/__init__.py
index 790a83767..16da81f23 100644
--- a/colossalai/amp/__init__.py
+++ b/colossalai/amp/__init__.py
@@ -10,6 +10,8 @@ from .torch_amp import convert_to_torch_amp
 from .apex_amp import convert_to_apex_amp
 from .naive_amp import convert_to_naive_amp
 
+__all__ = ['convert_to_amp', 'convert_to_naive_amp', 'convert_to_apex_amp', 'convert_to_torch_amp', 'AMP_TYPE']
+
 
 def convert_to_amp(model: nn.Module, optimizer: Optimizer, criterion: _Loss, mode: AMP_TYPE, amp_config: Config = None):
     """A helper function to wrap training components with Torch AMP modules.
diff --git a/colossalai/engine/ophooks/__init__.py b/colossalai/engine/ophooks/__init__.py
index 412df33c3..c2664b2af 100644
--- a/colossalai/engine/ophooks/__init__.py
+++ b/colossalai/engine/ophooks/__init__.py
@@ -1,119 +1,3 @@
-from typing import List, Callable, Optional
+from .utils import register_ophooks_recursively, BaseOpHook
 
-import torch
-
-from ._base_ophook import BaseOpHook
-from ._memtracer_ophook import MemTracerOpHook
-from ._shard_grad_ophook import ShardGradHook
-from ._shard_param_ophook import ShardParamHook
-
-all = ["BaseOpHook", "MemTracerOpHook", "register_ophooks_recursively", "ShardParamHook", "ShardGradHook"]
-
-
-# apply torch.autograd.Function that calls a backward_function to tensors in output
-def _apply_to_tensors_only(module, functional, backward_function, outputs):
-    if type(outputs) is tuple:
-        touched_outputs = []
-        for output in outputs:
-            touched_output = _apply_to_tensors_only(module, functional, backward_function, output)
-            touched_outputs.append(touched_output)
-        return tuple(touched_outputs)
-    elif type(outputs) is torch.Tensor:
-        return functional.apply(module, backward_function, outputs)
-    else:
-        return outputs
-
-
-class PreBackwardFunction(torch.autograd.Function):
-
-    @staticmethod
-    def forward(ctx, module, pre_backward_function, outputs):
-        ctx.module = module
-        ctx.pre_backward_function = pre_backward_function
-        module.applied_pre_backward = False
-        outputs = outputs.detach()
-        return outputs
-
-    @staticmethod
-    def backward(ctx, *args):
-        ctx.pre_backward_function(ctx.module)
-        return (None, None) + args
-
-
-class PostBackwardFunction(torch.autograd.Function):
-
-    @staticmethod
-    def forward(ctx, module, pre_backward_function, output):
-        ctx.module = module
-        output = output.detach()
-        ctx.pre_backward_function = pre_backward_function
-        return output
-
-    @staticmethod
-    def backward(ctx, *args):
-        """
-        Args:
-            activation_grad of the next layer.
-        Returns:
-            grad of the input activation.
-        """
-        ctx.pre_backward_function(ctx.module)
-        return (None, None) + args
-
-
-def register_ophooks_recursively(module: torch.nn.Module,
-                                 ophook_list: List[BaseOpHook] = None,
-                                 name: str = "",
-                                 filter_fn: Optional[Callable] = None):
-    r"""Recursilvely register pre/post hooks for all submodules in the module in FWD and BWD."""
-    assert isinstance(module, torch.nn.Module)
-
-    # Add hooks for submodules
-    for child_name, child in module.named_children():
-        register_ophooks_recursively(child, ophook_list, name + child_name, filter_fn)
-
-    # Early return on modules with no parameters.
-    if len(list(module.parameters(recurse=False))) == 0:
-        return
-
-    # return from flitered module
-    if filter_fn is not None and filter_fn(module):
-        return
-
-    if ophook_list is not None:
-        for hook in ophook_list:
-            assert (isinstance(hook, BaseOpHook))
-
-    def _pre_forward_module_hook(submodule, *args):
-        for hook in ophook_list:
-            assert isinstance(submodule, torch.nn.Module)
-            hook.pre_fwd_exec(submodule, *args)
-
-    def _post_forward_module_hook(submodule, *args):
-        for hook in ophook_list:
-            assert isinstance(submodule, torch.nn.Module)
-            hook.post_fwd_exec(submodule, *args)
-
-    def _pre_backward_module_hook(submodule, inputs, output):
-
-        def _run_before_backward_function(submodule):
-            for hook in ophook_list:
-                assert isinstance(submodule, torch.nn.Module)
-                hook.pre_bwd_exec(submodule, inputs, output)
-
-        return _apply_to_tensors_only(submodule, PreBackwardFunction, _run_before_backward_function, output)
-
-    def _post_backward_module_hook(submodule, inputs):
-
-        def _run_after_backward_function(submodule):
-            for hook in ophook_list:
-                assert isinstance(submodule, torch.nn.Module)
-                hook.post_bwd_exec(submodule, inputs)
-
-        return _apply_to_tensors_only(submodule, PostBackwardFunction, _run_after_backward_function, inputs)
-
-    module.register_forward_pre_hook(_pre_forward_module_hook)
-    module.register_forward_hook(_post_forward_module_hook)
-
-    module.register_forward_hook(_pre_backward_module_hook)
-    module.register_forward_pre_hook(_post_backward_module_hook)
+__all__ = ["BaseOpHook", "MemTracerOpHook", "register_ophooks_recursively"]
diff --git a/colossalai/engine/ophooks/_base_ophook.py b/colossalai/engine/ophooks/_base_ophook.py
deleted file mode 100644
index 24251141d..000000000
--- a/colossalai/engine/ophooks/_base_ophook.py
+++ /dev/null
@@ -1,30 +0,0 @@
-from abc import ABC, abstractmethod
-import torch
-
-
-class BaseOpHook(ABC):
-    """This class allows users to add customized operations
-    before and after the execution of a PyTorch submodule"""
-
-    def __init__(self):
-        pass
-
-    @abstractmethod
-    def pre_fwd_exec(self, module: torch.nn.Module, *args):
-        pass
-
-    @abstractmethod
-    def post_fwd_exec(self, module: torch.nn.Module, *args):
-        pass
-
-    @abstractmethod
-    def pre_bwd_exec(self, module: torch.nn.Module, input, output):
-        pass
-
-    @abstractmethod
-    def post_bwd_exec(self, module: torch.nn.Module, input):
-        pass
-
-    @abstractmethod
-    def post_iter(self):
-        pass
diff --git a/colossalai/engine/ophooks/utils.py b/colossalai/engine/ophooks/utils.py
new file mode 100644
index 000000000..26d485657
--- /dev/null
+++ b/colossalai/engine/ophooks/utils.py
@@ -0,0 +1,142 @@
+import torch
+from typing import List, Callable, Optional
+
+from abc import ABC, abstractmethod
+import torch
+
+
+class BaseOpHook(ABC):
+    """This class allows users to add customized operations
+    before and after the execution of a PyTorch submodule"""
+
+    def __init__(self):
+        pass
+
+    @abstractmethod
+    def pre_fwd_exec(self, module: torch.nn.Module, *args):
+        pass
+
+    @abstractmethod
+    def post_fwd_exec(self, module: torch.nn.Module, *args):
+        pass
+
+    @abstractmethod
+    def pre_bwd_exec(self, module: torch.nn.Module, input, output):
+        pass
+
+    @abstractmethod
+    def post_bwd_exec(self, module: torch.nn.Module, input):
+        pass
+
+    @abstractmethod
+    def post_iter(self):
+        pass
+
+
+# apply torch.autograd.Function that calls a backward_function to tensors in output
+def _apply_to_tensors_only(module, functional, backward_function, outputs):
+    if type(outputs) is tuple:
+        touched_outputs = []
+        for output in outputs:
+            touched_output = _apply_to_tensors_only(module, functional, backward_function, output)
+            touched_outputs.append(touched_output)
+        return tuple(touched_outputs)
+    elif type(outputs) is torch.Tensor:
+        return functional.apply(module, backward_function, outputs)
+    else:
+        return outputs
+
+
+class PreBackwardFunction(torch.autograd.Function):
+
+    @staticmethod
+    def forward(ctx, module, pre_backward_function, outputs):
+        ctx.module = module
+        ctx.pre_backward_function = pre_backward_function
+        module.applied_pre_backward = False
+        outputs = outputs.detach()
+        return outputs
+
+    @staticmethod
+    def backward(ctx, *args):
+        ctx.pre_backward_function(ctx.module)
+        return (None, None) + args
+
+
+class PostBackwardFunction(torch.autograd.Function):
+
+    @staticmethod
+    def forward(ctx, module, pre_backward_function, output):
+        ctx.module = module
+        output = output.detach()
+        ctx.pre_backward_function = pre_backward_function
+        return output
+
+    @staticmethod
+    def backward(ctx, *args):
+        """
+        Args:
+            activation_grad of the next layer.
+        Returns:
+            grad of the input activation.
+        """
+        ctx.pre_backward_function(ctx.module)
+        return (None, None) + args
+
+
+def register_ophooks_recursively(module: torch.nn.Module,
+                                 ophook_list: List[BaseOpHook] = None,
+                                 name: str = "",
+                                 filter_fn: Optional[Callable] = None):
+    r"""Recursilvely register pre/post hooks for all submodules in the module in FWD and BWD."""
+    assert isinstance(module, torch.nn.Module)
+
+    # Add hooks for submodules
+    for child_name, child in module.named_children():
+        register_ophooks_recursively(child, ophook_list, name + child_name, filter_fn)
+
+    # Early return on modules with no parameters.
+    if len(list(module.parameters(recurse=False))) == 0:
+        return
+
+    # return from flitered module
+    if filter_fn is not None and filter_fn(module):
+        return
+
+    if ophook_list is not None:
+        for hook in ophook_list:
+            assert (isinstance(hook, BaseOpHook))
+
+    def _pre_forward_module_hook(submodule, *args):
+        for hook in ophook_list:
+            assert isinstance(submodule, torch.nn.Module)
+            hook.pre_fwd_exec(submodule, *args)
+
+    def _post_forward_module_hook(submodule, *args):
+        for hook in ophook_list:
+            assert isinstance(submodule, torch.nn.Module)
+            hook.post_fwd_exec(submodule, *args)
+
+    def _pre_backward_module_hook(submodule, inputs, output):
+
+        def _run_before_backward_function(submodule):
+            for hook in ophook_list:
+                assert isinstance(submodule, torch.nn.Module)
+                hook.pre_bwd_exec(submodule, inputs, output)
+
+        return _apply_to_tensors_only(submodule, PreBackwardFunction, _run_before_backward_function, output)
+
+    def _post_backward_module_hook(submodule, inputs):
+
+        def _run_after_backward_function(submodule):
+            for hook in ophook_list:
+                assert isinstance(submodule, torch.nn.Module)
+                hook.post_bwd_exec(submodule, inputs)
+
+        return _apply_to_tensors_only(submodule, PostBackwardFunction, _run_after_backward_function, inputs)
+
+    module.register_forward_pre_hook(_pre_forward_module_hook)
+    module.register_forward_hook(_post_forward_module_hook)
+
+    module.register_forward_hook(_pre_backward_module_hook)
+    module.register_forward_pre_hook(_post_backward_module_hook)
diff --git a/colossalai/zero/shard_utils/__init__.py b/colossalai/zero/shard_utils/__init__.py
index 9a7917c63..5e5d63a7e 100644
--- a/colossalai/zero/shard_utils/__init__.py
+++ b/colossalai/zero/shard_utils/__init__.py
@@ -1,6 +1,5 @@
 from .base_shard_strategy import BaseShardStrategy
 from .bucket_tensor_shard_strategy import BucketTensorShardStrategy
 from .tensor_shard_strategy import TensorShardStrategy
-from .stateful_tensor_mgr import StatefulTensorMgr
 
-__all__ = ['BaseShardStrategy', 'TensorShardStrategy', 'BucketTensorShardStrategy', 'StatefulTensorMgr']
+__all__ = ['BaseShardStrategy', 'TensorShardStrategy', 'BucketTensorShardStrategy']
diff --git a/colossalai/zero/shard_utils/tensor_shard_strategy.py b/colossalai/zero/shard_utils/tensor_shard_strategy.py
index 761143cf3..8fba5f73a 100644
--- a/colossalai/zero/shard_utils/tensor_shard_strategy.py
+++ b/colossalai/zero/shard_utils/tensor_shard_strategy.py
@@ -3,7 +3,7 @@ from typing import List, Optional
 import torch
 import torch.distributed as dist
 from colossalai.utils import get_current_device
-from colossalai.zero.shard_utils.tensor_utils import colo_model_data_tensor_move_inline
+from colossalai.zero.sharded_param.tensor_utils import colo_model_data_tensor_move_inline
 from colossalai.zero.shard_utils import BaseShardStrategy
 from colossalai.zero.shard_utils.commons import get_shard
 from colossalai.zero.sharded_param.sharded_tensor import ShardedTensor
diff --git a/colossalai/zero/sharded_model/sharded_model_v2.py b/colossalai/zero/sharded_model/sharded_model_v2.py
index 2be5bac43..a324be8c5 100644
--- a/colossalai/zero/sharded_model/sharded_model_v2.py
+++ b/colossalai/zero/sharded_model/sharded_model_v2.py
@@ -8,9 +8,8 @@ import torch.nn as nn
 from colossalai.context.parallel_mode import ParallelMode
 from colossalai.core import global_context as gpc
 from colossalai.engine.ophooks import register_ophooks_recursively
-from colossalai.engine.ophooks.zero_hook import ZeroHook
+from colossalai.zero.utils import ZeroHook
 from colossalai.engine.paramhooks import BaseParamHookMgr
-from colossalai.engine.gradient_handler.utils import bucket_allreduce
 from colossalai.logging import get_dist_logger
 from colossalai.utils import get_current_device, disposable
 from colossalai.utils.memory_tracer.memstats_collector import MemStatsCollector
@@ -18,12 +17,12 @@ from colossalai.utils.memory_tracer.model_data_memtracer import \
     GLOBAL_MODEL_DATA_TRACER
 from colossalai.utils.memory import colo_device_memory_capacity
 from colossalai.zero.shard_utils import BaseShardStrategy
-from colossalai.zero.shard_utils.tensor_utils import colo_model_data_move_to_cpu
+from colossalai.zero.sharded_param.tensor_utils import colo_model_data_move_to_cpu
 from colossalai.zero.sharded_model.reduce_scatter import ReduceScatterBucketer
 from colossalai.zero.sharded_param.tensorful_state import TensorState
 from torch.distributed import ProcessGroup
 from torch.nn.parameter import Parameter
-from colossalai.zero.shard_utils.stateful_tensor_mgr import StatefulTensorMgr
+from colossalai.zero.utils.stateful_tensor_mgr import StatefulTensorMgr
 
 from ._utils import (cast_float_arguments, cast_tensor_to_fp16, cast_tensor_to_fp32, chunk_and_pad, free_storage,
                      get_gradient_predivide_factor)
diff --git a/colossalai/zero/sharded_optim/_utils.py b/colossalai/zero/sharded_optim/_utils.py
index 18dca5231..49cf21969 100644
--- a/colossalai/zero/sharded_optim/_utils.py
+++ b/colossalai/zero/sharded_optim/_utils.py
@@ -8,22 +8,6 @@ from colossalai.utils import is_model_parallel_parameter
 import torch.distributed as dist
 
 
-def move_tensor(input_, device):
-    assert device in ['cpu', 'gpu']
-
-    if isinstance(input_, (list, tuple)):
-        for tensor in input_:
-            tensor.data = tensor.data.cpu(
-            ) if device == 'cpu' else tensor.data.cuda()
-    elif torch.is_tensor(input_):
-        input_.data = input_.data.cpu(
-        ) if device == 'cpu' else tensor.data.cuda()
-    else:
-        raise TypeError(
-            f"Expected argument 'input_' to be torch.Tensor, list or tuple, but got {type(input_)} "
-        )
-
-
 def flatten(input_):
     return _flatten_dense_tensors(input_)
 
@@ -51,8 +35,7 @@ def shuffle_by_round_robin(tensor_list, num_partitions):
         partition_to_go = tensor_idx % num_partitions
         if partition_to_go not in partitions:
             partitions[partition_to_go] = []
-        partitions[partition_to_go].append(dict(tensor=tensor,
-                                                index=tensor_idx))
+        partitions[partition_to_go].append(dict(tensor=tensor, index=tensor_idx))
 
     partitions_count = len(partitions)
     new_tensor_list = []
@@ -73,9 +56,7 @@ def flatten_dense_tensors_with_padding(tensor_list, unit_size):
     padding = calculate_padding(num_elements, unit_size=unit_size)
 
     if padding > 0:
-        pad_tensor = torch.zeros(padding,
-                                 device=tensor_list[0].device,
-                                 dtype=tensor_list[0].dtype)
+        pad_tensor = torch.zeros(padding, device=tensor_list[0].device, dtype=tensor_list[0].dtype)
         padded_tensor_list = tensor_list + [pad_tensor]
     else:
         padded_tensor_list = tensor_list
@@ -86,6 +67,7 @@ def flatten_dense_tensors_with_padding(tensor_list, unit_size):
 def is_nccl_aligned(tensor):
     return tensor.data_ptr() % 4 == 0
 
+
 def get_grad_accumulate_object(tensor):
     """
     Return the AccumulateGrad of the input tensor
@@ -108,10 +90,7 @@ def get_grad_accumulate_object(tensor):
 
 
 def split_half_float_double(tensor_list):
-    dtypes = [
-        "torch.cuda.HalfTensor", "torch.cuda.FloatTensor",
-        "torch.cuda.DoubleTensor", "torch.cuda.BFloat16Tensor"
-    ]
+    dtypes = ["torch.cuda.HalfTensor", "torch.cuda.FloatTensor", "torch.cuda.DoubleTensor", "torch.cuda.BFloat16Tensor"]
     buckets = []
     for i, dtype in enumerate(dtypes):
         bucket = [t for t in tensor_list if t.type() == dtype]
@@ -120,10 +99,7 @@ def split_half_float_double(tensor_list):
     return buckets
 
 
-def reduce_tensor(tensor,
-                  dtype,
-                  dst_rank=None,
-                  parallel_mode=ParallelMode.DATA):
+def reduce_tensor(tensor, dtype, dst_rank=None, parallel_mode=ParallelMode.DATA):
     """
     Reduce the tensor in the data parallel process group
 
@@ -165,6 +141,7 @@ def reduce_tensor(tensor,
             tensor.copy_(tensor_to_reduce)
     return tensor
 
+
 def has_inf_or_nan(tensor):
     try:
         # if tensor is half, the .float() incurs an additional deep copy, but it's necessary if
@@ -181,8 +158,7 @@ def has_inf_or_nan(tensor):
             raise
         return True
     else:
-        if tensor_sum == float('inf') or tensor_sum == -float(
-                'inf') or tensor_sum != tensor_sum:
+        if tensor_sum == float('inf') or tensor_sum == -float('inf') or tensor_sum != tensor_sum:
             return True
         return False
 
@@ -201,11 +177,7 @@ def calculate_global_norm_from_list(norm_list):
     return math.sqrt(total_norm)
 
 
-def compute_norm(gradients,
-                 params,
-                 dp_group,
-                 mp_group,
-                 norm_type=2):
+def compute_norm(gradients, params, dp_group, mp_group, norm_type=2):
     """Clips gradient norm of an iterable of parameters.
     This is adapted from torch.nn.utils.clip_grad.clip_grad_norm_ and
     added functionality to handle model parallel parameters. Note that
@@ -229,14 +201,11 @@ def compute_norm(gradients,
     if norm_type == inf:
         total_norm = max(g.data.abs().max() for g in gradients)
         total_norm_cuda = torch.cuda.FloatTensor([float(total_norm)])
-        dist.all_reduce(total_norm_cuda,
-                        op=torch.distributed.ReduceOp.MAX,
-                        group=dp_group)
+        dist.all_reduce(total_norm_cuda, op=torch.distributed.ReduceOp.MAX, group=dp_group)
 
         # Take max across all GPUs.
         if mp_group is not None:
-            dist.all_reduce(tensor=total_norm_cuda,
-                            op=torch.distributed.ReduceOp.MAX)
+            dist.all_reduce(tensor=total_norm_cuda, op=torch.distributed.ReduceOp.MAX)
         total_norm = total_norm_cuda[0].item()
     else:
         total_norm = 0.0
@@ -248,21 +217,17 @@ def compute_norm(gradients,
             if is_model_parallel_parameter(p) or mp_rank == 0:
                 param_norm = g.data.double().norm(2)
                 total_norm += param_norm.item()**2
-            
+
         # Sum across all model parallel GPUs.
         total_norm_cuda = torch.cuda.FloatTensor([float(total_norm)])
-        torch.distributed.all_reduce(total_norm_cuda,
-                                     op=torch.distributed.ReduceOp.SUM,
-                                     group=dp_group)
-        
+        torch.distributed.all_reduce(total_norm_cuda, op=torch.distributed.ReduceOp.SUM, group=dp_group)
+
         if mp_group is not None:
-            dist.all_reduce(tensor=total_norm_cuda,
-                            op=torch.distributed.ReduceOp.SUM)
+            dist.all_reduce(tensor=total_norm_cuda, op=torch.distributed.ReduceOp.SUM)
 
         total_norm = total_norm_cuda[0].item()**(1. / norm_type)
 
-    if total_norm == float(
-            'inf') or total_norm == -float('inf') or total_norm != total_norm:
+    if total_norm == float('inf') or total_norm == -float('inf') or total_norm != total_norm:
         total_norm = -1
 
     return total_norm
diff --git a/colossalai/zero/sharded_optim/sharded_optim_v2.py b/colossalai/zero/sharded_optim/sharded_optim_v2.py
index d4b0a8c46..88464b0e1 100644
--- a/colossalai/zero/sharded_optim/sharded_optim_v2.py
+++ b/colossalai/zero/sharded_optim/sharded_optim_v2.py
@@ -12,8 +12,8 @@ from colossalai.logging import get_dist_logger
 from colossalai.nn.optimizer import ColossalaiOptimizer
 from colossalai.utils.memory_tracer.model_data_memtracer import \
     GLOBAL_MODEL_DATA_TRACER
-from colossalai.zero.shard_utils.tensor_utils import (colo_model_data_tensor_move_inline, colo_model_tensor_clone,
-                                                      colo_tensor_mem_usage)
+from colossalai.zero.sharded_param.tensor_utils import (colo_model_data_tensor_move_inline, colo_model_tensor_clone,
+                                                        colo_tensor_mem_usage)
 from colossalai.zero.sharded_model import ShardedModelV2
 from colossalai.zero.sharded_model._utils import cast_tensor_to_fp32
 from colossalai.zero.sharded_optim._utils import has_inf_or_nan
diff --git a/colossalai/zero/sharded_param/__init__.py b/colossalai/zero/sharded_param/__init__.py
index 5642a504a..f6f46db8e 100644
--- a/colossalai/zero/sharded_param/__init__.py
+++ b/colossalai/zero/sharded_param/__init__.py
@@ -1,4 +1,11 @@
 from colossalai.zero.sharded_param.sharded_tensor import ShardedTensor
 from colossalai.zero.sharded_param.sharded_param import ShardedParamV2
+from colossalai.zero.sharded_param.tensor_utils import (colo_model_data_tensor_move, colo_model_data_tensor_move_inline,
+                                                        colo_model_data_move_to_cpu, colo_model_tensor_clone,
+                                                        colo_tensor_mem_usage)
+from colossalai.zero.sharded_param.tensorful_state import TensorState, StatefulTensor
 
-__all__ = ['ShardedTensor', 'ShardedParamV2']
+__all__ = [
+    'ShardedTensor', 'ShardedParamV2', 'colo_model_data_tensor_move', 'colo_model_data_tensor_move_inline',
+    'colo_model_data_move_to_cpu', 'colo_model_tensor_clone', 'colo_tensor_mem_usage', 'TensorState', 'StatefulTensor'
+]
diff --git a/colossalai/zero/sharded_param/sharded_param.py b/colossalai/zero/sharded_param/sharded_param.py
index dff933a83..51c3d8556 100644
--- a/colossalai/zero/sharded_param/sharded_param.py
+++ b/colossalai/zero/sharded_param/sharded_param.py
@@ -1,7 +1,7 @@
 import torch
 from colossalai.zero.sharded_param import ShardedTensor
 from typing import Optional, Tuple
-from colossalai.zero.shard_utils.tensor_utils import colo_tensor_mem_usage
+from colossalai.zero.sharded_param.tensor_utils import colo_tensor_mem_usage
 from .tensorful_state import StatefulTensor, TensorState
 from typing import List
 
diff --git a/colossalai/zero/shard_utils/tensor_utils.py b/colossalai/zero/sharded_param/tensor_utils.py
similarity index 100%
rename from colossalai/zero/shard_utils/tensor_utils.py
rename to colossalai/zero/sharded_param/tensor_utils.py
diff --git a/colossalai/zero/utils/__init__.py b/colossalai/zero/utils/__init__.py
new file mode 100644
index 000000000..2153ebe34
--- /dev/null
+++ b/colossalai/zero/utils/__init__.py
@@ -0,0 +1,4 @@
+from .stateful_tensor_mgr import StatefulTensorMgr
+from .zero_hook import ZeroHook
+
+__all__ = ['StatefulTensorMgr', 'ZeroHook']
\ No newline at end of file
diff --git a/colossalai/zero/shard_utils/stateful_tensor_mgr.py b/colossalai/zero/utils/stateful_tensor_mgr.py
similarity index 97%
rename from colossalai/zero/shard_utils/stateful_tensor_mgr.py
rename to colossalai/zero/utils/stateful_tensor_mgr.py
index 817a383d8..1674775a2 100644
--- a/colossalai/zero/shard_utils/stateful_tensor_mgr.py
+++ b/colossalai/zero/utils/stateful_tensor_mgr.py
@@ -4,7 +4,7 @@ import types
 from colossalai.utils.cuda import get_current_device
 from colossalai.zero.sharded_param.sharded_param import ShardedParamV2
 from colossalai.zero.sharded_param.tensorful_state import StatefulTensor, TensorState
-from colossalai.zero.shard_utils.tensor_utils import colo_model_data_tensor_move_inline, colo_tensor_mem_usage
+from colossalai.zero.sharded_param.tensor_utils import colo_model_data_tensor_move_inline, colo_tensor_mem_usage
 from colossalai.utils.memory import colo_device_memory_capacity
 from colossalai.utils.memory_tracer.model_data_memtracer import GLOBAL_MODEL_DATA_TRACER
 from typing import Dict, List
diff --git a/colossalai/engine/ophooks/zero_hook.py b/colossalai/zero/utils/zero_hook.py
similarity index 96%
rename from colossalai/engine/ophooks/zero_hook.py
rename to colossalai/zero/utils/zero_hook.py
index 4dfe924dd..14e502530 100644
--- a/colossalai/engine/ophooks/zero_hook.py
+++ b/colossalai/zero/utils/zero_hook.py
@@ -3,15 +3,16 @@ from typing import Optional
 import torch
 import torch.distributed as dist
 from colossalai.registry import OPHOOKS
+
 from colossalai.utils import get_current_device
 from colossalai.utils.memory_tracer.memstats_collector import MemStatsCollector
+
 from colossalai.zero.shard_utils import BaseShardStrategy
 from colossalai.zero.sharded_param.tensorful_state import TensorState
-from colossalai.zero.shard_utils.stateful_tensor_mgr import StatefulTensorMgr
+from colossalai.zero.utils.stateful_tensor_mgr import StatefulTensorMgr
+from colossalai.zero.sharded_param.tensor_utils import colo_model_data_tensor_move_inline
 
-from ._base_ophook import BaseOpHook
-
-from colossalai.zero.shard_utils.tensor_utils import colo_model_data_tensor_move_inline
+from colossalai.engine.ophooks import BaseOpHook
 
 
 @OPHOOKS.register_module
diff --git a/tests/test_utils/test_commons.py b/tests/test_utils/test_commons.py
index 6580ae37f..d588f42d9 100644
--- a/tests/test_utils/test_commons.py
+++ b/tests/test_utils/test_commons.py
@@ -1,4 +1,4 @@
-from colossalai.zero.shard_utils.tensor_utils import colo_model_data_tensor_move, colo_model_data_tensor_move_inline
+from colossalai.zero.sharded_param.tensor_utils import colo_model_data_tensor_move, colo_model_data_tensor_move_inline
 from colossalai.utils import free_port
 from colossalai.testing import rerun_on_exception
 from colossalai.zero.sharded_param import ShardedTensor
diff --git a/tests/test_utils/test_tensor_move.py b/tests/test_utils/test_tensor_move.py
index 62874d652..cf1677d4b 100644
--- a/tests/test_utils/test_tensor_move.py
+++ b/tests/test_utils/test_tensor_move.py
@@ -1,11 +1,12 @@
 import pytest
 
+import colossalai
 from colossalai.utils.cuda import get_current_device
-from colossalai.zero.shard_utils.tensor_utils import colo_tensor_mem_usage, colo_model_data_tensor_move, colo_model_data_tensor_move_inline, colo_model_data_move_to_cpu, colo_model_tensor_clone
+from colossalai.zero.sharded_param import (StatefulTensor, colo_tensor_mem_usage, colo_model_data_tensor_move,
+                                           colo_model_data_tensor_move_inline, colo_model_data_move_to_cpu,
+                                           colo_model_tensor_clone)
 from colossalai.utils.memory import colo_set_process_memory_fraction, colo_device_memory_capacity
 from colossalai.utils import free_port
-from colossalai.zero.sharded_param.tensorful_state import StatefulTensor
-import colossalai
 
 import torch
 
diff --git a/tests/test_zero_data_parallel/test_found_inf.py b/tests/test_zero_data_parallel/test_found_inf.py
index 22c3a80fd..6bdd667e4 100644
--- a/tests/test_zero_data_parallel/test_found_inf.py
+++ b/tests/test_zero_data_parallel/test_found_inf.py
@@ -30,10 +30,9 @@ def _run_test_found_inf(cpu_offload, shard_strategy_class, gpu_margin_mem_ratio)
         get_components_func = non_distributed_component_funcs.get_callable(model_name)
         model_builder, train_dataloader, _, optimizer_class, criterion = get_components_func()
 
-        with ZeroInitContext(
-                target_device=torch.device(f'cpu:0') if cpu_offload else torch.device(get_current_device()),
-                shard_strategy=shard_strategy,
-                shard_param=True):
+        with ZeroInitContext(target_device=torch.device(f'cpu:0') if cpu_offload else get_current_device(),
+                             shard_strategy=shard_strategy,
+                             shard_param=True):
             zero_model = model_builder(checkpoint=True)
         zero_model = ShardedModelV2(
             zero_model,
diff --git a/tests/test_zero_data_parallel/test_stateful_tensor_mgr.py b/tests/test_zero_data_parallel/test_stateful_tensor_mgr.py
index af8165de2..ed76d27a7 100644
--- a/tests/test_zero_data_parallel/test_stateful_tensor_mgr.py
+++ b/tests/test_zero_data_parallel/test_stateful_tensor_mgr.py
@@ -6,7 +6,7 @@ from colossalai.utils.cuda import get_current_device
 from colossalai.utils.memory_tracer import MemStatsCollector
 from colossalai.utils.memory_tracer.model_data_memtracer import GLOBAL_MODEL_DATA_TRACER
 from colossalai.utils.memory import colo_device_memory_capacity, colo_set_process_memory_fraction
-from colossalai.zero.shard_utils import StatefulTensorMgr
+from colossalai.zero.utils import StatefulTensorMgr
 from colossalai.zero.sharded_param.sharded_param import ShardedParamV2
 from colossalai.zero.sharded_param.tensorful_state import TensorState
 from colossalai.utils import free_port