diff --git a/pcdet/ops/iou3d_nms/src/iou3d_nms_api.cpp b/pcdet/ops/iou3d_nms/src/iou3d_nms_api.cpp
new file mode 100644
index 0000000..972b55b
--- /dev/null
+++ b/pcdet/ops/iou3d_nms/src/iou3d_nms_api.cpp
@@ -0,0 +1,20 @@
+#include <torch/serialize/tensor.h>
+#include <torch/extension.h>
+#include <vector>
+#include <cuda.h>
+#include <cuda_runtime_api.h>
+
+#include "iou3d_cpu.h"
+#include "iou3d_nms.h"
+
+
+PYBIND11_MODULE(TORCH_EXTENSION_NAME, m) {
+    m.def("boxes_aligned_overlap_bev_gpu", &boxes_aligned_overlap_bev_gpu, "aligned oriented boxes overlap");
+	m.def("boxes_overlap_bev_gpu", &boxes_overlap_bev_gpu, "oriented boxes overlap");
+	m.def("paired_boxes_overlap_bev_gpu", &paired_boxes_overlap_bev_gpu, "oriented boxes overlap");
+	m.def("boxes_iou_bev_gpu", &boxes_iou_bev_gpu, "oriented boxes iou");
+	m.def("nms_gpu", &nms_gpu, "oriented nms gpu");
+	m.def("nms_normal_gpu", &nms_normal_gpu, "nms gpu");
+	m.def("boxes_aligned_iou_bev_cpu", &boxes_aligned_iou_bev_cpu, "aligned oriented boxes iou");
+	m.def("boxes_iou_bev_cpu", &boxes_iou_bev_cpu, "oriented boxes iou");
+}