diff --git a/doc/doc_ch/algorithm_rec_sar.md b/doc/doc_ch/algorithm_rec_sar.md
index b8304313994754480a89d708e39149d67f828c0d..cfb1de25390bda8c6ba4be1db9101269873e8b5b 100644
--- a/doc/doc_ch/algorithm_rec_sar.md
+++ b/doc/doc_ch/algorithm_rec_sar.md
@@ -79,7 +79,7 @@ python3 tools/export_model.py -c configs/rec/rec_r31_sar.yml -o Global.pretraine
 SAR文本识别模型推理，可以执行如下命令：
 
 ```
-python3 tools/infer/predict_rec.py --image_dir="./doc/imgs_words/en/word_1.png" --rec_model_dir="./inference/rec_sar/" --rec_image_shape="3, 48, 48, 160" --rec_char_type="ch" --rec_algorithm="SAR" --rec_char_dict_path="ppocr/utils/dict90.txt" --max_text_length=30 --use_space_char=False
+python3 tools/infer/predict_rec.py --image_dir="./doc/imgs_words/en/word_1.png" --rec_model_dir="./inference/rec_sar/" --rec_image_shape="3, 48, 48, 160" --rec_algorithm="SAR" --rec_char_dict_path="ppocr/utils/dict90.txt" --max_text_length=30 --use_space_char=False
 ```
 
 <a name="4-2"></a>
diff --git a/doc/doc_en/algorithm_rec_sar_en.md b/doc/doc_en/algorithm_rec_sar_en.md
index 24b87c10c3b2839909392bf3de0e0c850112fcdc..5c8319da3bc63dce55b0d5eae749ed4500b9d2f6 100644
--- a/doc/doc_en/algorithm_rec_sar_en.md
+++ b/doc/doc_en/algorithm_rec_sar_en.md
@@ -79,7 +79,7 @@ python3 tools/export_model.py -c configs/rec/rec_r31_sar.yml -o Global.pretraine
 For SAR text recognition model inference, the following commands can be executed:
 
 ```
-python3 tools/infer/predict_rec.py --image_dir="./doc/imgs_words/en/word_1.png" --rec_model_dir="./inference/rec_sar/" --rec_image_shape="3, 48, 48, 160" --rec_char_type="ch" --rec_algorithm="SAR" --rec_char_dict_path="ppocr/utils/dict90.txt" --max_text_length=30 --use_space_char=False
+python3 tools/infer/predict_rec.py --image_dir="./doc/imgs_words/en/word_1.png" --rec_model_dir="./inference/rec_sar/" --rec_image_shape="3, 48, 48, 160" --rec_algorithm="SAR" --rec_char_dict_path="ppocr/utils/dict90.txt" --max_text_length=30 --use_space_char=False
 ```
 
 <a name="4-2"></a>
diff --git a/tools/export_model.py b/tools/export_model.py
index a61e5ca9342f2858a582deced67ca2f4cf807eb6..54edb50413f4a757e4632b05ec4922c5145b922c 100755
--- a/tools/export_model.py
+++ b/tools/export_model.py
@@ -58,6 +58,8 @@ def export_single_model(model,
         other_shape = [
             paddle.static.InputSpec(
                 shape=[None, 3, 48, 160], dtype="float32"),
+            [paddle.static.InputSpec(
+                shape=[None], dtype="float32")]
         ]
         model = to_static(model, input_spec=other_shape)
     elif arch_config["algorithm"] == "SVTR":
@@ -232,4 +234,4 @@ def main():
 
 
 if __name__ == "__main__":
-    main()
\ No newline at end of file
+    main()
diff --git a/tools/infer/predict_rec.py b/tools/infer/predict_rec.py
index 449f69ed6a22cb12af8a6a2ef8f2eedc1aca087c..1a483da751037c5c49242725871d0708afd48a07 100755
--- a/tools/infer/predict_rec.py
+++ b/tools/infer/predict_rec.py
@@ -439,7 +439,8 @@ class TextRecognizer(object):
                 valid_ratios = np.concatenate(valid_ratios)
                 inputs = [
                     norm_img_batch,
-                    valid_ratios,
+                    np.array(
+                        [valid_ratios], dtype=np.float32),
                 ]
                 if self.use_onnx:
                     input_dict = {}