diff --git a/tools/infer/utility.py b/tools/infer/utility.py
index 1c82280099f17f6d3bf848669e47439505f10576..93b54505c36e5f18913bad8b70d49b4f28334477 100755
--- a/tools/infer/utility.py
+++ b/tools/infer/utility.py
@@ -231,13 +231,13 @@ def create_predictor(args, mode, logger):
             max_input_shape.update(max_pact_shape)
             opt_input_shape.update(opt_pact_shape)
         elif mode == "rec":
-            min_input_shape = {"x": [args.rec_batch_num, 3, 32, 10]}
+            min_input_shape = {"x": [1, 3, 32, 10]}
             max_input_shape = {"x": [args.rec_batch_num, 3, 32, 2000]}
-            opt_input_shape = {"x": [args.rec_batch_num, 3, 32, 320]}
+            opt_input_shape = {"x": [512, 3, 32, 320]}
         elif mode == "cls":
-            min_input_shape = {"x": [args.rec_batch_num, 3, 48, 10]}
+            min_input_shape = {"x": [1, 3, 48, 10]}
             max_input_shape = {"x": [args.rec_batch_num, 3, 48, 2000]}
-            opt_input_shape = {"x": [args.rec_batch_num, 3, 48, 320]}
+            opt_input_shape = {"x": [512, 3, 48, 320]}
         else:
             min_input_shape = {"x": [1, 3, 10, 10]}
             max_input_shape = {"x": [1, 3, 1000, 1000]}