diff --git a/pcdet/models/backbones_3d/__init__.py b/pcdet/models/backbones_3d/__init__.py
new file mode 100644
index 0000000..0a25c62
--- /dev/null
+++ b/pcdet/models/backbones_3d/__init__.py
@@ -0,0 +1,22 @@
+from .pointnet2_backbone import PointNet2Backbone, PointNet2MSG
+from .spconv_backbone import VoxelBackBone8x, VoxelResBackBone8x
+from .spconv_backbone_2d import PillarBackBone8x, PillarRes18BackBone8x
+from .spconv_backbone_focal import VoxelBackBone8xFocal
+from .spconv_backbone_voxelnext import VoxelResBackBone8xVoxelNeXt
+from .spconv_backbone_voxelnext2d import VoxelResBackBone8xVoxelNeXt2D
+from .spconv_unet import UNetV2
+from .dsvt import DSVT
+
+__all__ = {
+    'VoxelBackBone8x': VoxelBackBone8x,
+    'UNetV2': UNetV2,
+    'PointNet2Backbone': PointNet2Backbone,
+    'PointNet2MSG': PointNet2MSG,
+    'VoxelResBackBone8x': VoxelResBackBone8x,
+    'VoxelBackBone8xFocal': VoxelBackBone8xFocal,
+    'VoxelResBackBone8xVoxelNeXt': VoxelResBackBone8xVoxelNeXt,
+    'VoxelResBackBone8xVoxelNeXt2D': VoxelResBackBone8xVoxelNeXt2D,
+    'PillarBackBone8x': PillarBackBone8x,
+    'PillarRes18BackBone8x': PillarRes18BackBone8x,
+    'DSVT': DSVT,
+}