diff --git a/colossalai/gemini/__init__.py b/colossalai/gemini/__init__.py
index a82640d67..9c7407eb5 100644
--- a/colossalai/gemini/__init__.py
+++ b/colossalai/gemini/__init__.py
@@ -1,6 +1,8 @@
-from .chunk import TensorInfo, TensorState
+from .chunk import ChunkManager, TensorInfo, TensorState
+from .gemini_mgr import GeminiManager
 from .stateful_tensor_mgr import StatefulTensorMgr
 from .tensor_placement_policy import TensorPlacementPolicyFactory
-from .gemini_mgr import GeminiManager
 
-__all__ = ['StatefulTensorMgr', 'TensorPlacementPolicyFactory', 'GeminiManager', 'TensorInfo', 'TensorState']
+__all__ = [
+    'StatefulTensorMgr', 'TensorPlacementPolicyFactory', 'GeminiManager', 'TensorInfo', 'TensorState', 'ChunkManager'
+]