diff --git a/doc/Model_Zoo_CN.md b/doc/Model_Zoo_CN.md
new file mode 100644
index 0000000000000000000000000000000000000000..308683bc2022f6c61d9418472f0a758e481f0777
--- /dev/null
+++ b/doc/Model_Zoo_CN.md
@@ -0,0 +1,61 @@
+# Model Zoo
+
+本页面展示了Paddle Serving目前支持的预训练模型以及下载链接
+若您想为Paddle Serving提供新的模型，可通过[pull request](https://github.com/PaddlePaddle/Serving/pulls)提交PR
+
+特别感谢[Padddle wholechain](https://www.paddlepaddle.org.cn/wholechain)以及[PaddleHub](https://www.paddlepaddle.org.cn/hub)为Paddle Serving提供的部分预训练模型
+
+
+| 模型 | 类型 | 部署方式 | 下载 | 服务端 |
+| --- | --- | --- | ---- | --- |
+| resnet_v2_50_imagenet | PaddleClas | [单模型](../examples/PaddleClas/resnet_v2_50)</br>[多模型](../examples/pipeline/PaddleClas/ResNet_V2_50) | [.tar.gz](https://paddle-serving.bj.bcebos.com/paddle_hub_models/image/ImageClassification/resnet_v2_50_imagenet.tar.gz) | Pipeline Serving, C++ Serving|
+| mobilenet_v2_imagenet | PaddleClas | [单模型](../examples/PaddleClas/mobilenet) | [.tar.gz](https://paddle-serving.bj.bcebos.com/paddle_hub_models/image/ImageClassification/mobilenet_v2_imagenet.tar.gz) |C++ Serving|
+| resnet50_vd | PaddleClas | [单模型](../examples/PaddleClas/imagenet)</br>[多模型](../examples/pipeline/PaddleClas/ResNet50_vd) | [.tar.gz](https://paddle-serving.bj.bcebos.com/ResNet50_vd.tar) |Pipeline Serving, C++ Serving|
+| ResNet50_vd_KL | PaddleClas | [多模型](../examples/pipeline/PaddleClas/ResNet50_vd_KL) | [.tar](https://paddle-serving.bj.bcebos.com/model/ResNet50_vd_KL.tar) |Pipeline Serving|
+| DarkNet53 | PaddleClas | [多模型](../examples/pipeline/PaddleClas/DarkNet53) | [.tar](https://paddle-serving.bj.bcebos.com/model/DarkNet53.tar) |Pipeline Serving|
+| MobileNetV1 | PaddleClas | [多模型](../examples/pipeline/PaddleClas/MobileNetV1) | [.tar](https://paddle-serving.bj.bcebos.com/model/MobileNetV1.tar) |Pipeline Serving|
+| MobileNetV2 | PaddleClas | [多模型](../examples/pipeline/PaddleClas/MobileNetV2) | [.tar](https://paddle-serving.bj.bcebos.com/model/MobileNetV2.tar) |Pipeline Serving|
+| MobileNetV3_large_x1_0 | PaddleClas | [多模型](../examples/pipeline/PaddleClas/MobileNetV3_large_x1_0) | [.tar](https://paddle-serving.bj.bcebos.com/model/MobileNetV3_large_x1_0.tar) |Pipeline Serving|
+| ResNet50_vd_FPGM | PaddleClas | [多模型](../examples/pipeline/PaddleClas/ResNet50_vd_FPGM) | [.tar](https://paddle-serving.bj.bcebos.com/model/ResNet50_vd_FPGM.tar) |Pipeline Serving|
+| ResNet50_vd_PACT | PaddleClas | [多模型](../examples/pipeline/PaddleClas/ResNet50_vd_PACT) | [.tar](https://paddle-serving.bj.bcebos.com/model/ResNet50_vd_PACT.tar) |Pipeline Serving|
+| ResNeXt101_vd_64x4d | PaddleClas | [多模型](../examples/pipeline/PaddleClas/ResNeXt101_vd_64x4d) | [.tar](https://paddle-serving.bj.bcebos.com/model/ResNeXt101_vd_64x4d.tar) |Pipeline Serving|
+| HRNet_W18_C | PaddleClas | [多模型](../examples/pipeline/PaddleClas/HRNet_W18_C) | [.tar](https://paddle-serving.bj.bcebos.com/model/HRNet_W18_C.tar) |Pipeline Serving|
+| ShuffleNetV2_x1_0 | PaddleClas | [多模型](../examples/pipeline/PaddleClas/ShuffleNetV2_x1_0) | [.tar](https://paddle-serving.bj.bcebos.com/model/ShuffleNetV2_x1_0.tar) |Pipeline Serving|
+| bert_chinese_L-12_H-768_A-12 | PaddleNLP | [单模型](../examples/PaddleNLP/bert)</br>[多模型](../examples/pipeline/bert) | [.tar.gz](https://paddle-serving.bj.bcebos.com/paddle_hub_models/text/SemanticModel/bert_chinese_L-12_H-768_A-12.tar.gz) |Pipeline Serving, C++ Serving|
+| senta_bilstm | PaddleNLP | [单模型](../examples/PaddleNLP/senta) | [.tar.gz](https://paddle-serving.bj.bcebos.com/paddle_hub_models/text/SentimentAnalysis/senta_bilstm.tar.gz) |C++ Serving|
+| lac | PaddleNLP | [单模型](../examples/PaddleNLP/lac) | [.tar.gz](https://paddle-serving.bj.bcebos.com/paddle_hub_models/text/LexicalAnalysis/lac.tar.gz) | C++ Serving|
+| transformer | PaddleNLP | [多模型](https://github.com/PaddlePaddle/PaddleNLP/blob/develop/examples/machine_translation/transformer/deploy/serving/README.md) | [model](https://github.com/PaddlePaddle/PaddleNLP/tree/develop/examples/machine_translation/transformer) | Pipeline Serving|
+| criteo_ctr | PaddleRec | [单模型](../examples/PaddleRec/criteo_ctr) | [.tar.gz](https://paddle-serving.bj.bcebos.com/criteo_ctr_example/criteo_ctr_demo_model.tar.gz) | C++ Serving |
+| criteo_ctr_with_cube | PaddleRec | [单模型](../examples/PaddleRec/criteo_ctr_with_cube) | [.tar.gz](https://paddle-serving.bj.bcebos.com/unittest/ctr_cube_unittest.tar.gz) |C++ Serving|
+| wide&deep | PaddleRec | [单模型](https://github.com/PaddlePaddle/PaddleRec/blob/release/2.1.0/doc/serving.md) | [model](https://github.com/PaddlePaddle/PaddleRec/blob/release/2.1.0/models/rank/wide_deep/README.md) |C++ Serving|
+| blazeface | PaddleDetection | [单模型](../examples/PaddleDetection/blazeface) | [.tar.gz](https://paddle-serving.bj.bcebos.com/paddle_hub_models/image/ObjectDetection/blazeface.tar.gz) |C++ Serving|
+| cascade_mask_rcnn_r50_vd_fpn_ssld_2x_coco | PaddleDetection | [单模型](../examples/PaddleDetection/cascade_rcnn) | [.tar.gz](https://paddle-serving.bj.bcebos.com/pddet_demo/cascade_mask_rcnn_r50_vd_fpn_ssld_2x_coco_serving.tar.gz) |C++ Serving|
+| yolov4 | PaddleDetection | [单模型](../examples/PaddleDetection/yolov4) | [.tar.gz](https://paddle-serving.bj.bcebos.com/paddle_hub_models/image/ObjectDetection/yolov4.tar.gz) |C++ Serving|
+| faster_rcnn_hrnetv2p_w18_1x | PaddleDetection | [单模型](../examples/PaddleDetection/faster_rcnn_hrnetv2p_w18_1x) | [.tar.gz](https://paddle-serving.bj.bcebos.com/pddet_demo/faster_rcnn_hrnetv2p_w18_1x.tar.gz) |C++ Serving|
+| fcos_dcn_r50_fpn_1x_coco | PaddleDetection | [单模型](../examples/PaddleDetection/fcos_dcn_r50_fpn_1x_coco) | [.tar.gz](https://paddle-serving.bj.bcebos.com/pddet_demo/2.0/fcos_dcn_r50_fpn_1x_coco.tar) |C++ Serving|
+| ssd_vgg16_300_240e_voc | PaddleDetection |  [单模型](../examples/PaddleDetection/ssd_vgg16_300_240e_voc) | [.tar](https://paddle-serving.bj.bcebos.com/pddet_demo/2.0/ssd_vgg16_300_240e_voc.tar) |C++ Serving |
+| yolov3_darknet53_270e_coco  | PaddleDetection | [单模型](../examples/PaddleDetection/yolov3_darknet53_270e_coco)</br>[多模型](../examples/pipeline/PaddleDetection/yolov3) | [.tar](https://paddle-serving.bj.bcebos.com/pddet_demo/2.0/yolov3_darknet53_270e_coco.tar) |Pipeline Serving, C++ Serving |
+| faster_rcnn_r50_fpn_1x_coco | PaddleDetection | [单模型](../examples/PaddleDetection/faster_rcnn_r50_fpn_1x_coco)</br>[多模型](../examples/pipeline/PaddleDetection/faster_rcnn) | [.tar](https://paddle-serving.bj.bcebos.com/pddet_demo/2.0/faster_rcnn_r50_fpn_1x_coco.tar) |Pipeline Serving, C++ Serving |
+| ppyolo_r50vd_dcn_1x_coco | PaddleDetection |  [单模型](../examples/PaddleDetection/ppyolo_r50vd_dcn_1x_coco) | [.tar](https://paddle-serving.bj.bcebos.com/pddet_demo/2.0/ppyolo_r50vd_dcn_1x_coco.tar) |C++ Serving |
+| ppyolo_mbv3_large_coco | PaddleDetection |  [多模型](../examples/pipeline/PaddleDetection/ppyolo_mbv3) | [.tar](https://paddle-serving.bj.bcebos.com/pddet_demo/2.0/ppyolo_mbv3_large_coco.tar) |Pipeline Serving |
+| ttfnet_darknet53_1x_coco | PaddleDetection | [单模型](../examples/PaddleDetection/ttfnet_darknet53_1x_coco) | [.tar](https://paddle-serving.bj.bcebos.com/pddet_demo/ttfnet_darknet53_1x_coco.tar) |C++ Serving |
+| YOLOv3-DarkNet | PaddleDetection | [单模型](https://github.com/PaddlePaddle/PaddleDetection/tree/release/2.3/deploy/serving) | [.pdparams](https://paddledet.bj.bcebos.com/models/yolov3_darknet53_270e_coco.pdparams)</br>[.yml](https://github.com/PaddlePaddle/PaddleDetection/blob/develop/configs/yolov3/yolov3_darknet53_270e_coco.yml) |C++ Serving |
+| ocr_rec | PaddleOCR | [单模型](../examples/PaddleOCR/ocr_rec_det)</br>[多模型](../examples/pipeline/ocr) | [.tar.gz](https://paddle-serving.bj.bcebos.com/paddle_hub_models/image/OCR/ocr_rec.tar.gz) |Pipeline Serving, C++ Serving |
+| ocr_det | PaddleOCR | [单模型](../examples/PaddleOCR/ocr_rec_det)</br>[多模型](../examples/pipeline/ocr) | [.tar.gz](https://paddle-serving.bj.bcebos.com/ocr/ocr_det.tar.gz) |Pipeline Serving, C++ Serving |
+| ch_ppocr_mobile_v2.0_det | PaddleOCR | [多模型](https://github.com/PaddlePaddle/PaddleOCR/blob/release/2.3/deploy/pdserving/README.md) | [model](https://paddleocr.bj.bcebos.com/dygraph_v2.0/ch/ch_ppocr_mobile_v2.0_det_infer.tar)</br>[.yml](https://github.com/PaddlePaddle/PaddleOCR/blob/release/2.3/configs/det/ch_ppocr_v2.0/ch_det_mv3_db_v2.0.yml) |Pipeline Serving |
+| ch_ppocr_server_v2.0_det | PaddleOCR | [多模型](https://github.com/PaddlePaddle/PaddleOCR/blob/release/2.3/deploy/pdserving/README.md) | [model](https://paddleocr.bj.bcebos.com/dygraph_v2.0/ch/ch_ppocr_server_v2.0_det_infer.tar)</br>[.yml](https://github.com/PaddlePaddle/PaddleOCR/blob/release/2.3/configs/det/ch_ppocr_v2.0/ch_det_res18_db_v2.0.yml) |Pipeline Serving |
+| ch_ppocr_mobile_v2.0_rec | PaddleOCR | [多模型](https://github.com/PaddlePaddle/PaddleOCR/blob/release/2.3/deploy/pdserving/README.md) | [model](https://paddleocr.bj.bcebos.com/dygraph_v2.0/ch/ch_ppocr_mobile_v2.0_rec_infer.tar)</br>[.yml](https://github.com/PaddlePaddle/PaddleOCR/blob/release/2.3/configs/rec/ch_ppocr_v2.0/rec_chinese_lite_train_v2.0.yml) |Pipeline Serving |
+| ch_ppocr_server_v2.0_rec | PaddleOCR | [多模型](https://github.com/PaddlePaddle/PaddleOCR/blob/release/2.3/deploy/pdserving/README.md) | [model](https://paddleocr.bj.bcebos.com/dygraph_v2.0/ch/ch_ppocr_server_v2.0_rec_infer.tar)</br>[.yml](https://github.com/PaddlePaddle/PaddleOCR/blob/release/2.3/configs/rec/ch_ppocr_v2.0/rec_chinese_common_train_v2.0.yml) |Pipeline Serving |
+| ch_ppocr_mobile_v2.0 | PaddleOCR | [多模型](https://github.com/PaddlePaddle/PaddleOCR/blob/release/2.3/deploy/pdserving/README.md) | [model](https://github.com/PaddlePaddle/PaddleOCR) |Pipeline Serving |
+| ch_ppocr_server_v2.0 | PaddleOCR | [多模型](https://github.com/PaddlePaddle/PaddleOCR/blob/release/2.3/deploy/pdserving/README.md) | [model](https://github.com/PaddlePaddle/PaddleOCR) |Pipeline Serving |
+| deeplabv3 | PaddleSeg | [单模型](../examples/PaddleSeg/deeplabv3) | [.tar.gz](https://paddle-serving.bj.bcebos.com/paddle_hub_models/image/ImageSegmentation/deeplabv3.tar.gz) | C++ Serving |
+| unet | PaddleSeg | [单模型](../examples/PaddleSeg/unet_for_image_seg) | [.tar.gz](https://paddle-serving.bj.bcebos.com/paddle_hub_models/image/ImageSegmentation/unet.tar.gz) |C++ Serving |
+
+- 注意事项
+  - 多模型部署示例均在pipeline文件夹下
+  - 单模型采用C++ Serving，多模型采用Pipeline Serving
+
+- 请参考 [example](../examples) 查看详情
+
+- 更多模型请参考[wholechain](https://www.paddlepaddle.org.cn/wholechain)
+
diff --git a/python/paddle_serving_server/util.py b/python/paddle_serving_server/util.py
index 8f0d610ac0f971c43ba73214cd992bb6106df0ca..85c9341c7848631394d348521131c3e0ae1455d7 100644
--- a/python/paddle_serving_server/util.py
+++ b/python/paddle_serving_server/util.py
@@ -91,6 +91,7 @@ def dump_pid_file(portList, model):
        dump_pid_file([9494, 10082], 'serve')
     '''
     pid = os.getpid()
+    gid = os.getpgid(pid)
     pidInfoList = []
     filepath = os.path.join(CONF_HOME, "ProcessInfo.json")
     if os.path.exists(filepath):
@@ -105,7 +106,7 @@ def dump_pid_file(portList, model):
                         pidInfoList.remove(info)
 
     with open(filepath, "w") as fp:
-        info ={"pid": pid, "port" : portList, "model" : str(model), "start_time" : time.time()}
+        info ={"pid": gid, "port" : portList, "model" : str(model), "start_time" : time.time()}
         pidInfoList.append(info)
         json.dump(pidInfoList, fp)