diff --git a/tools/infer/predict_det.py b/tools/infer/predict_det.py
index ba0adaee258096ea9970425cc05ca7a8f1cf08c4..820d3413176cd606a32c1c27fa362eca58ee03ab 100755
--- a/tools/infer/predict_det.py
+++ b/tools/infer/predict_det.py
@@ -70,6 +70,9 @@ class TextDetector(object):
             postprocess_params["cover_thresh"] = args.det_east_cover_thresh
             postprocess_params["nms_thresh"] = args.det_east_nms_thresh
         elif self.det_algorithm == "SAST":
+            pre_process_list[0] = {
+                'DetResizeForTest': {'resize_long': args.det_limit_side_len}
+            }
             postprocess_params['name'] = 'SASTPostProcess'
             postprocess_params["score_thresh"] = args.det_sast_score_thresh
             postprocess_params["nms_thresh"] = args.det_sast_nms_thresh