diff --git a/deploy/fastdeploy/serving/fastdeploy_serving/models/det_postprocess/1/model.py b/deploy/fastdeploy/serving/fastdeploy_serving/models/det_postprocess/1/model.py
index 9d43832ca5..733dd6a36b 100644
--- a/deploy/fastdeploy/serving/fastdeploy_serving/models/det_postprocess/1/model.py
+++ b/deploy/fastdeploy/serving/fastdeploy_serving/models/det_postprocess/1/model.py
@@ -202,7 +202,7 @@ def execute(self, requests):
                         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()