diff --git a/ppocr/utils/gen_label.py b/ppocr/utils/gen_label.py
index fb78bd38bcfc1a59cac48a28bbb655ecb83bcb3f..56d75544dbee596a87343c90320b0ea3178e6b28 100644
--- a/ppocr/utils/gen_label.py
+++ b/ppocr/utils/gen_label.py
@@ -29,7 +29,7 @@ def gen_rec_label(input_path, out_label):
 def gen_det_label(root_path, input_dir, out_label):
     with open(out_label, 'w') as out_file:
         for label_file in os.listdir(input_dir):
-            img_path = root_path + label_file[3:-4] + ".jpg"
+            img_path = os.path.join(root_path, label_file[3:-4] + ".jpg")
             label = []
             with open(
                     os.path.join(input_dir, label_file), 'r',
diff --git a/tools/infer/utility.py b/tools/infer/utility.py
index 207b2e5f35dec8934fd2875748e8bcc21a94b7bf..83451e9496393cc04b86a9766f747f959a921ad7 100644
--- a/tools/infer/utility.py
+++ b/tools/infer/utility.py
@@ -42,6 +42,7 @@ def init_args():
     parser.add_argument("--min_subgraph_size", type=int, default=15)
     parser.add_argument("--precision", type=str, default="fp32")
     parser.add_argument("--gpu_mem", type=int, default=500)
+    parser.add_argument("--gpu_id", type=int, default=0)
 
     # params for text detector
     parser.add_argument("--image_dir", type=str)
@@ -219,7 +220,7 @@ def create_predictor(args, mode, logger):
                 logger.warning(
                     "GPU is not found in current device by nvidia-smi. Please check your device or ignore it if run on jetson."
                 )
-            config.enable_use_gpu(args.gpu_mem, 0)
+            config.enable_use_gpu(args.gpu_mem, args.gpu_id)
             if args.use_tensorrt:
                 config.enable_tensorrt_engine(
                     workspace_size=1 << 30,