diff --git a/examples/vision/ocr/PP-OCR/serving/fastdeploy_serving/models/det_postprocess/1/model.py b/examples/vision/ocr/PP-OCR/serving/fastdeploy_serving/models/det_postprocess/1/model.py
index a2b581e957..103d51a072 100644
--- a/examples/vision/ocr/PP-OCR/serving/fastdeploy_serving/models/det_postprocess/1/model.py
+++ b/examples/vision/ocr/PP-OCR/serving/fastdeploy_serving/models/det_postprocess/1/model.py
@@ -190,7 +190,7 @@ class TritonPythonModel:
                             index] > self.cls_threshold:
                         image_list[index] = cv2.rotate(
                             image_list[index].astype(np.float32), 1)
-                        image_list[index] = np.astype(np.uint8)
+                        image_list[index] = image_list[index].astype(np.uint8)
 
                 rec_pre_tensors = self.rec_preprocessor.run(image_list)
                 rec_dlpack_tensor = rec_pre_tensors[0].to_dlpack()