diff --git a/deploy/pipeline/ppvehicle/vehicleplate_postprocess.py b/deploy/pipeline/ppvehicle/vehicleplate_postprocess.py
index 66a00a3410340995a058368abfc333a35f454b66..d0506bb9ff05e280ffca6e7b52de7c3a230817dc 100644
--- a/deploy/pipeline/ppvehicle/vehicleplate_postprocess.py
+++ b/deploy/pipeline/ppvehicle/vehicleplate_postprocess.py
@@ -153,10 +153,10 @@ class DBPostProcess(object):
         '''
         h, w = bitmap.shape[:2]
         box = _box.copy()
-        xmin = np.clip(np.floor(box[:, 0].min()).astype(np.int), 0, w - 1)
-        xmax = np.clip(np.ceil(box[:, 0].max()).astype(np.int), 0, w - 1)
-        ymin = np.clip(np.floor(box[:, 1].min()).astype(np.int), 0, h - 1)
-        ymax = np.clip(np.ceil(box[:, 1].max()).astype(np.int), 0, h - 1)
+        xmin = np.clip(np.floor(box[:, 0].min()).astype(np.int32), 0, w - 1)
+        xmax = np.clip(np.ceil(box[:, 0].max()).astype(np.int32), 0, w - 1)
+        ymin = np.clip(np.floor(box[:, 1].min()).astype(np.int32), 0, h - 1)
+        ymax = np.clip(np.ceil(box[:, 1].max()).astype(np.int32), 0, h - 1)
 
         mask = np.zeros((ymax - ymin + 1, xmax - xmin + 1), dtype=np.uint8)
         box[:, 0] = box[:, 0] - xmin