diff --git a/deploy/cpp_infer/tools/config.txt b/deploy/cpp_infer/tools/config.txt
index 7e03b9d13af9b65239dc257059ef0fa94106e880..16ec8e1e679c8b2d738da2eb60dd9ec2541efa5f 100644
--- a/deploy/cpp_infer/tools/config.txt
+++ b/deploy/cpp_infer/tools/config.txt
@@ -21,6 +21,7 @@ cls_thresh  0.9
 # rec config
 rec_model_dir  ./inference/rec_crnn
 char_list_file ../../ppocr/utils/ppocr_keys_v1.txt
+rec_batch_num  30
 
 # show the detection results
 visualize 1