diff --git a/examples/vision/detection/paddledetection/python/infer_faster_rcnn.py b/examples/vision/detection/paddledetection/python/infer_faster_rcnn.py
index 1100aa8a602..d75ea2d4db0 100644
--- a/examples/vision/detection/paddledetection/python/infer_faster_rcnn.py
+++ b/examples/vision/detection/paddledetection/python/infer_faster_rcnn.py
@@ -52,7 +52,7 @@ def build_option(args):
 
 # 预测图片检测结果
 im = cv2.imread(args.image)
-result = model.predict(im)
+result = model.predict(im.copy())
 print(result)
 
 # 预测结果可视化
diff --git a/examples/vision/detection/paddledetection/python/infer_picodet.py b/examples/vision/detection/paddledetection/python/infer_picodet.py
index 06bfad03c0d..8bf1da7b532 100644
--- a/examples/vision/detection/paddledetection/python/infer_picodet.py
+++ b/examples/vision/detection/paddledetection/python/infer_picodet.py
@@ -52,7 +52,7 @@ def build_option(args):
 
 # 预测图片检测结果
 im = cv2.imread(args.image)
-result = model.predict(im)
+result = model.predict(im.copy())
 print(result)
 
 # 预测结果可视化
diff --git a/examples/vision/detection/paddledetection/python/infer_ppyolo.py b/examples/vision/detection/paddledetection/python/infer_ppyolo.py
index 029f3dc21d5..d0a286da320 100644
--- a/examples/vision/detection/paddledetection/python/infer_ppyolo.py
+++ b/examples/vision/detection/paddledetection/python/infer_ppyolo.py
@@ -52,7 +52,7 @@ def build_option(args):
 
 # 预测图片检测结果
 im = cv2.imread(args.image)
-result = model.predict(im)
+result = model.predict(im.copy())
 print(result)
 
 # 预测结果可视化
diff --git a/examples/vision/detection/paddledetection/python/infer_ppyoloe.py b/examples/vision/detection/paddledetection/python/infer_ppyoloe.py
index ae533a50937..138bdf1ce43 100644
--- a/examples/vision/detection/paddledetection/python/infer_ppyoloe.py
+++ b/examples/vision/detection/paddledetection/python/infer_ppyoloe.py
@@ -52,7 +52,7 @@ def build_option(args):
 
 # 预测图片检测结果
 im = cv2.imread(args.image)
-result = model.predict(im)
+result = model.predict(im.copy())
 print(result)
 
 # 预测结果可视化
diff --git a/examples/vision/detection/paddledetection/python/infer_yolov3.py b/examples/vision/detection/paddledetection/python/infer_yolov3.py
index 7ea372ff238..27a6fd16b3b 100644
--- a/examples/vision/detection/paddledetection/python/infer_yolov3.py
+++ b/examples/vision/detection/paddledetection/python/infer_yolov3.py
@@ -53,7 +53,7 @@ def build_option(args):
 
 # 预测图片检测结果
 im = cv2.imread(args.image)
-result = model.predict(im)
+result = model.predict(im.copy())
 print(result)
 
 # 预测结果可视化
diff --git a/examples/vision/detection/paddledetection/python/infer_yolox.py b/examples/vision/detection/paddledetection/python/infer_yolox.py
index f65b1d8b122..415e0b69ea1 100644
--- a/examples/vision/detection/paddledetection/python/infer_yolox.py
+++ b/examples/vision/detection/paddledetection/python/infer_yolox.py
@@ -52,7 +52,7 @@ def build_option(args):
 
 # 预测图片检测结果
 im = cv2.imread(args.image)
-result = model.predict(im)
+result = model.predict(im.copy())
 print(result)
 
 # 预测结果可视化