diff --git a/lite/kernels/arm/yolo_box_compute.cc b/lite/kernels/arm/yolo_box_compute.cc
index ad8a630b8c0064af7358674d1b7424eff25a194a..38443bf27726ee879b38e3058c8d3a48df975baf 100644
--- a/lite/kernels/arm/yolo_box_compute.cc
+++ b/lite/kernels/arm/yolo_box_compute.cc
@@ -32,6 +32,8 @@ void YoloBoxCompute::Run() {
   int class_num = param.class_num;
   float conf_thresh = param.conf_thresh;
   int downsample_ratio = param.downsample_ratio;
+  Boxes->clear();
+  Scores->clear();
   lite::arm::math::yolobox(X,
                            ImgSize,
                            Boxes,