diff --git a/PaddleCV/yolov3/README.md b/PaddleCV/yolov3/README.md
index 6f14bea951a103f3496467f52108db7ab40b8330..109c8dba13ebf51489be3126dd06031d4348cd19 100644
--- a/PaddleCV/yolov3/README.md
+++ b/PaddleCV/yolov3/README.md
@@ -155,7 +155,9 @@ Inference is used to get prediction score or image features based on trained mod
         --image_name=000000000139.jpg \
         --draw_threshold=0.5
 
-Inference speed:
+- Set ```export CUDA_VISIBLE_DEVICES=0``` to specifiy one GPU to infer.
+
+Inference speed（Tesla P40）:
 
 
 |   input size  | 608x608 | 416x416 | 320x320 |
diff --git a/PaddleCV/yolov3/README_cn.md b/PaddleCV/yolov3/README_cn.md
index cd12f8353bb19657931839cbaa51ee983297de17..cfb01ee91d2d8329fd6d747b870807c62864b97a 100644
--- a/PaddleCV/yolov3/README_cn.md
+++ b/PaddleCV/yolov3/README_cn.md
@@ -157,7 +157,9 @@ Train Loss
         --image_name=000000000139.jpg \
         --draw_threshold=0.5
 
-模型预测速度：
+- 通过设置export CUDA\_VISIBLE\_DEVICES=0指定单卡GPU预测。
+
+模型预测速度（Tesla P40）：
 
 
 |   input size  | 608x608 | 416x416 | 320x320 |