diff --git a/tools/export_model.py b/tools/export_model.py
index f587b2bb3..bdff89f75 100755
--- a/tools/export_model.py
+++ b/tools/export_model.py
@@ -53,17 +53,19 @@ def main():
     save_path = '{}/inference'.format(config['Global']['save_inference_dir'])
 
     if config['Architecture']['algorithm'] == "SRN":
+        max_text_length = config['Architecture']['Head']['max_text_length']
         other_shape = [
             paddle.static.InputSpec(
                 shape=[None, 1, 64, 256], dtype='float32'), [
                     paddle.static.InputSpec(
                         shape=[None, 256, 1],
                         dtype="int64"), paddle.static.InputSpec(
-                            shape=[None, 25, 1],
-                            dtype="int64"), paddle.static.InputSpec(
-                                shape=[None, 8, 25, 25], dtype="int64"),
+                            shape=[None, max_text_length, 1], dtype="int64"),
                     paddle.static.InputSpec(
-                        shape=[None, 8, 25, 25], dtype="int64")
+                        shape=[None, 8, max_text_length, max_text_length],
+                        dtype="int64"), paddle.static.InputSpec(
+                            shape=[None, 8, max_text_length, max_text_length],
+                            dtype="int64")
                 ]
         ]
         model = to_static(model, input_spec=other_shape)