diff --git a/docs/en/user_guides/inference.md b/docs/en/user_guides/inference.md
index 86f5ec46..6cb4f03b 100644
--- a/docs/en/user_guides/inference.md
+++ b/docs/en/user_guides/inference.md
@@ -1,32 +1,77 @@
 # Inference with existing models
 
-MMPretrain provides pre-trained models in [Model Zoo](../modelzoo_statistics.md).
-This note will show **how to use existing models to inference on given images**.
+This tutorial will show how to use the following APIs：
 
-As for how to test existing models on standard datasets, please see this [guide](./test.md)
+1. [**`list_models`**](mmpretrain.apis.list_models) & [**`get_model`**](mmpretrain.apis.get_model) ：list models in MMPreTrain and get a specific model.
+2. [**`ImageClassificationInferencer`**](mmpretrain.apis.ImageClassificationInferencer): inference on given images.
+3. [**`FeatureExtractor`**](mmpretrain.apis.FeatureExtractor): extract features from the image files directly.
+
+## List models and Get model
+
+list all the models in MMPreTrain.
+
+```
+>>> from mmpretrain import list_models
+>>> list_models()
+['barlowtwins_resnet50_8xb256-coslr-300e_in1k',
+ 'beit-base-p16_beit-in21k-pre_3rdparty_in1k',
+ .................]
+```
+
+`list_models` supports fuzzy matching, you can use **\*** to match any character.
+
+```
+>>> from mmpretrain import list_models
+>>> list_models("*convnext-b*21k")
+['convnext-base_3rdparty_in21k',
+ 'convnext-base_in21k-pre-3rdparty_in1k-384px',
+ 'convnext-base_in21k-pre_3rdparty_in1k']
+```
+
+you can use `get_model` get the model.
+
+```
+>>> from mmpretrain import get_model
+
+# model without pre-trained weight
+>>> model = get_model("convnext-base_in21k-pre_3rdparty_in1k")
+
+# model with default weight in MMPreTrain
+>>> model = get_model("convnext-base_in21k-pre_3rdparty_in1k", pretrained=True)
+
+# model with weight in local
+>>> model = get_model("convnext-base_in21k-pre_3rdparty_in1k", pretrained="your_local_checkpoint_path")
+
+# you can also do some modification, like modify the num_classes in head.
+>>> model = get_model("convnext-base_in21k-pre_3rdparty_in1k", head=dict(num_classes=10))
+
+# you can get model without neck, head, and output from stage 1, 2, 3 in backbone
+>>> model_headless = get_model("resnet18_8xb32_in1k", head=None, neck=None, backbone=dict(out_indices=(1, 2, 3)))
+```
+
+Then you can do the forward:
+
+```
+>>> import torch
+>>> from mmpretrain import get_model
+>>> model = get_model('convnext-base_in21k-pre_3rdparty_in1k', pretrained=True)
+>>> x = torch.rand((1, 3, 224, 224))
+>>> y = model(x)
+>>> print(type(y), y.shape)
+<class 'torch.Tensor'> torch.Size([1, 1000])
+```
 
 ## Inference on a given image
 
-MMPretrain provides high-level Python APIs for inference on a given image:
-
-- [`get_model`](mmpretrain.apis.get_model): Get a model with the model name.
-- [`inference_model`](mmpretrain.apis.inference_model): Inference on a given image
-
-Here is an example of building the model and inference on a given image by using ImageNet-1k pre-trained checkpoint.
-
-```{note}
-You can use `wget https://github.com/open-mmlab/mmpretrain/raw/main/demo/demo.JPEG` to download the example image or use your own image.
-```
+Here is an example of building the inferencer on a [given image](https://github.com/open-mmlab/mmpretrain/raw/main/demo/demo.JPEG) by using ImageNet-1k pre-trained checkpoint.
 
 ```python
-from mmpretrain import get_model, inference_model
+>>> from mmpretrain import ImageClassificationInferencer
 
-img_path = 'demo.JPEG'   # you can specify your own picture path
-
-# build the model from a config file and a checkpoint file
-model = get_model('resnet50_8xb32_in1k', pretrained=True, device="cpu")  # device can be 'cuda:0'
-# test a single image
-result = inference_model(model, img_path)
+>>> inferencer = ImageClassificationInferencer('resnet50_8xb32_in1k')
+>>> results = inferencer('https://github.com/open-mmlab/mmpretrain/raw/main/demo/demo.JPEG')
+>>> print(results[0]['pred_class'])
+sea snake
 ```
 
 `result` is a dictionary containing `pred_label`, `pred_score`, `pred_scores` and `pred_class`, the result is as follows:
@@ -35,4 +80,39 @@ result = inference_model(model, img_path)
 {"pred_label":65,"pred_score":0.6649366617202759,"pred_class":"sea snake", "pred_scores": [..., 0.6649366617202759, ...]}
 ```
 
-An image demo can be found in [demo/image_demo.py](https://github.com/open-mmlab/mmpretrain/blob/main/demo/image_demo.py).
+If you want to use your own config and checkpoint:
+
+```
+>>> from mmpretrain import ImageClassificationInferencer
+>>> inferencer = ImageClassificationInferencer(
+            model='configs/resnet/resnet50_8xb32_in1k.py',
+            pretrained='https://download.openmmlab.com/mmclassification/v0/resnet/resnet50_8xb32_in1k_20210831-ea4938fc.pth',
+            device='cuda')
+>>> inferencer('https://github.com/open-mmlab/mmpretrain/raw/main/demo/demo.JPEG')
+```
+
+You can also inference multiple images by batch on CUDA:
+
+```python
+>>> from mmpretrain import ImageClassificationInferencer
+
+>>> inferencer = ImageClassificationInferencer('resnet50_8xb32_in1k', device='cuda')
+>>> imgs = ['https://github.com/open-mmlab/mmpretrain/raw/main/demo/demo.JPEG'] * 5
+>>> results = inferencer(imgs, batch_size=2)
+>>> print(results[1]['pred_class'])
+sea snake
+```
+
+## Extract Features From Image
+
+Compared with `model.extract_feat`, `FeatureExtractor` is used to extract features from the image files directly, instead of a batch of tensors.
+In a word, the input of `model.extract_feat` is `torch.Tensor`, the input of `FeatureExtractor` is images.
+
+```
+>>> from mmpretrain import FeatureExtractor, get_model
+>>> model = get_model('resnet50_8xb32_in1k', backbone=dict(out_indices=(0, 1, 2, 3)))
+>>> extractor = FeatureExtractor(model)
+>>> features = extractor('https://github.com/open-mmlab/mmpretrain/raw/main/demo/demo.JPEG')[0]
+>>> features[0].shape, features[1].shape, features[2].shape, features[3].shape
+(torch.Size([256]), torch.Size([512]), torch.Size([1024]), torch.Size([2048]))
+```
diff --git a/docs/zh_CN/user_guides/inference.md b/docs/zh_CN/user_guides/inference.md
index 5bd07344..a5efb8bd 100644
--- a/docs/zh_CN/user_guides/inference.md
+++ b/docs/zh_CN/user_guides/inference.md
@@ -1,38 +1,117 @@
-# 使用现有模型推理
+# 使用现有模型进行推理
 
-MMPretrain 在 [Model Zoo](../modelzoo_statistics.md) 中提供了预训练模型。
-本说明将展示**如何使用现有模型对给定图像进行推理**。
+本文将展示如何使用以下API：
 
-至于如何在标准数据集上测试现有模型，请看这个[指南](./test.md)
+1. [**`list_models`**](mmpretrain.apis.list_models) 和 [**`get_model`**](mmpretrain.apis.get_model) ：列出 MMPreTrain 中的模型并获取模型。
+2. [**`ImageClassificationInferencer`**](mmpretrain.apis.ImageClassificationInferencer): 在给定图像上进行推理。
+3. [**`FeatureExtractor`**](mmpretrain.apis.FeatureExtractor): 从图像文件直接提取特征。
 
-## 推理单张图片
+## 列出模型和获取模型
 
-MMPretrain 为图像推理提供高级 Python API：
+列出 MMPreTrain 中的所有已支持的模型。
 
-- [`get_model`](mmpretrain.apis.get_model): 根据名称获取一个模型。
-- [`inference_model`](mmpretrain.apis.inference_model)：对给定图片进行推理。
-
-下面是一个示例，如何使用一个 ImageNet-1k 预训练权重初始化模型并推理给定图像。
-
-```{note}
-可以运行 `wget https://github.com/open-mmlab/mmpretrain/raw/main/demo/demo.JPEG` 下载样例图片，或使用其他图片。
+```
+>>> from mmpretrain import list_models
+>>> list_models()
+['barlowtwins_resnet50_8xb256-coslr-300e_in1k',
+ 'beit-base-p16_beit-in21k-pre_3rdparty_in1k',
+ .................]
 ```
 
-```python
-from mmpretrain import get_model, inference_model
+`list_models` 支持模糊匹配，您可以使用 **\*** 匹配任意字符。
 
-img_path = 'demo.JPEG'   # 可以指定自己的图片路径
-
-# 构建模型
-model = get_model('resnet50_8xb32_in1k', pretrained=True, device="cpu")  # `device` 可以为 'cuda:0'
-# 执行推理
-result = inference_model(model, img_path)
+```
+>>> from mmpretrain import list_models
+>>> list_models("*convnext-b*21k")
+['convnext-base_3rdparty_in21k',
+ 'convnext-base_in21k-pre-3rdparty_in1k-384px',
+ 'convnext-base_in21k-pre_3rdparty_in1k']
 ```
 
-`result` 为一个包含了 `pred_label`, `pred_score`, `pred_scores` 和 `pred_class`的字典，结果如下：
+了解了已经支持了哪些模型后，你可以使用 `get_model` 获取特定模型。
 
-```text
+```
+>>> from mmpretrain import get_model
+
+# 没有预训练权重的模型
+>>> model = get_model("convnext-base_in21k-pre_3rdparty_in1k")
+
+# 使用MMPreTrain中默认的权重
+>>> model = get_model("convnext-base_in21k-pre_3rdparty_in1k", pretrained=True)
+
+# 使用本地权重
+>>> model = get_model("convnext-base_in21k-pre_3rdparty_in1k", pretrained="your_local_checkpoint_path")
+
+# 您还可以做一些修改，例如修改 head 中的 num_classes。
+>>> model = get_model("convnext-base_in21k-pre_3rdparty_in1k", head=dict(num_classes=10))
+
+# 您可以获得没有 neck，head 的模型，并直接从 backbone 中的 stage 1, 2, 3 输出
+>>> model_headless = get_model("resnet18_8xb32_in1k", head=None, neck=None, backbone=dict(out_indices=(1, 2, 3)))
+```
+
+得到模型后，你可以进行推理：
+
+```
+>>> import torch
+>>> from mmpretrain import get_model
+>>> model = get_model('convnext-base_in21k-pre_3rdparty_in1k', pretrained=True)
+>>> x = torch.rand((1, 3, 224, 224))
+>>> y = model(x)
+>>> print(type(y), y.shape)
+<class 'torch.Tensor'> torch.Size([1, 1000])
+```
+
+## 在给定图像上进行推理
+
+这是一个使用 ImageNet-1k 预训练权重在给定图像上构建推理器的示例。
+
+```
+>>> from mmpretrain import ImageClassificationInferencer
+
+>>> inferencer = ImageClassificationInferencer('resnet50_8xb32_in1k')
+>>> results = inferencer('https://github.com/open-mmlab/mmpretrain/raw/main/demo/demo.JPEG')
+>>> print(results[0]['pred_class'])
+sea snake
+```
+
+result 是一个包含 pred_label、pred_score、pred_scores 和 pred_class 的字典，结果如下：
+
+```{text}
 {"pred_label":65,"pred_score":0.6649366617202759,"pred_class":"sea snake", "pred_scores": [..., 0.6649366617202759, ...]}
 ```
 
-演示可以在 [demo/image_demo.py](https://github.com/open-mmlab/mmpretrain/blob/main/demo/image_demo.py) 中找到。
+如果你想使用自己的配置和权重：
+
+```
+>>> from mmpretrain import ImageClassificationInferencer
+>>> inferencer = ImageClassificationInferencer(
+            model='configs/resnet/resnet50_8xb32_in1k.py',
+            pretrained='https://download.openmmlab.com/mmclassification/v0/resnet/resnet50_8xb32_in1k_20210831-ea4938fc.pth',
+            device='cuda')
+>>> inferencer('https://github.com/open-mmlab/mmpretrain/raw/main/demo/demo.JPEG')
+```
+
+你还可以在CUDA上通过批处理进行多个图像的推理：
+
+```{python}
+>>> from mmpretrain import ImageClassificationInferencer
+
+>>> inferencer = ImageClassificationInferencer('resnet50_8xb32_in1k', device='cuda')
+>>> imgs = ['https://github.com/open-mmlab/mmpretrain/raw/main/demo/demo.JPEG'] * 5
+>>> results = inferencer(imgs, batch_size=2)
+>>> print(results[1]['pred_class'])
+sea snake
+```
+
+## 从图像中提取特征
+
+与 `model.extract_feat` 相比，`FeatureExtractor` 用于直接从图像文件中提取特征，而不是从一批张量中提取特征。简单说，`model.extract_feat` 的输入是 `torch.Tensor`，`FeatureExtractor` 的输入是图像。
+
+```
+>>> from mmpretrain import FeatureExtractor, get_model
+>>> model = get_model('resnet50_8xb32_in1k', backbone=dict(out_indices=(0, 1, 2, 3)))
+>>> extractor = FeatureExtractor(model)
+>>> features = extractor('https://github.com/open-mmlab/mmpretrain/raw/main/demo/demo.JPEG')[0]
+>>> features[0].shape, features[1].shape, features[2].shape, features[3].shape
+(torch.Size([256]), torch.Size([512]), torch.Size([1024]), torch.Size([2048]))
+```
diff --git a/mmpretrain/apis/image_classification.py b/mmpretrain/apis/image_classification.py
index 712abb2e..e261a568 100644
--- a/mmpretrain/apis/image_classification.py
+++ b/mmpretrain/apis/image_classification.py
@@ -28,7 +28,7 @@ class ImageClassificationInferencer(BaseInferencer):
             file, or a :obj:`BaseModel` object. The model name can be found
             by ``ImageClassificationInferencer.list_models()`` and you can also
             query it in :doc:`/modelzoo_statistics`.
-        weights (str, optional): Path to the checkpoint. If None, it will try
+        pretrained (str, optional): Path to the checkpoint. If None, it will try
             to find a pre-defined weight from the model you specified
             (only work if the ``model`` is a model name). Defaults to None.
         device (str, optional): Device to run inference. If None, use CPU or
@@ -51,7 +51,7 @@ class ImageClassificationInferencer(BaseInferencer):
            >>> from mmpretrain import ImageClassificationInferencer
            >>> inferencer = ImageClassificationInferencer(
                    model='configs/resnet/resnet50_8xb32_in1k.py',
-                   weights='https://download.openmmlab.com/mmclassification/v0/resnet/resnet50_8xb32_in1k_20210831-ea4938fc.pth',
+                   pretrained='https://download.openmmlab.com/mmclassification/v0/resnet/resnet50_8xb32_in1k_20210831-ea4938fc.pth',
                    device='cuda')
            >>> inferencer(['demo/dog.jpg', 'demo/bird.JPEG'], show_dir="./visualize/")
     """  # noqa: E501