diff --git a/tools/infer_det.py b/tools/infer_det.py
index ce16da8dc5fffb3f5fdc633aeb00a386a2d60d4f..5ce1f2ffc4e936488801feec5034f5c8ef45df89 100755
--- a/tools/infer_det.py
+++ b/tools/infer_det.py
@@ -52,7 +52,7 @@ def draw_det_res(dt_boxes, config, img, img_name, save_path):
         cv2.imwrite(save_path, src_im)
         logger.info("The detected Image saved in {}".format(save_path))
 
-
+@paddle.no_grad()
 def main():
     global_config = config['Global']