diff --git a/mmdeploy/mmcv/ops/nms.py b/mmdeploy/mmcv/ops/nms.py
index b384d75d47..952a17b6ef 100644
--- a/mmdeploy/mmcv/ops/nms.py
+++ b/mmdeploy/mmcv/ops/nms.py
@@ -349,10 +349,6 @@ def _multiclass_nms_single(boxes: Tensor,
     dets = torch.cat([boxes, scores], dim=2)
     labels = cls_inds.unsqueeze(0)
 
-    # pad
-    dets = torch.cat((dets, dets.new_zeros((1, 1, 5))), 1)
-    labels = torch.cat((labels, labels.new_zeros((1, 1))), 1)
-
     # topk or sort
     is_use_topk = keep_top_k > 0 and \
         (torch.onnx.is_in_onnx_export() or keep_top_k < dets.shape[1])
@@ -369,7 +365,7 @@ def _multiclass_nms_single(boxes: Tensor,
         if pre_top_k > 0:
             bbox_index = pre_topk_inds[None, box_inds]
         if keep_top_k > 0:
-            bbox_index = bbox_index[:, topk_inds[:-1]]
+            bbox_index = bbox_index[:, topk_inds]
         return dets, labels, bbox_index
     else:
         return dets, labels