Alibaba font icon library is a font-based icon library that can be used through CSS styles.

Here are the steps to use Alibaba font icon library:

1. Register an account on the official website of Alibaba font icon library (https://www.iconfont.cn/) and log in.

2. Enter keywords in the search box, or browse the categories to find the icons you need.

3. Click the icon to enter the icon details page, where you can view the icon's name, code, Unicode code and other information.

4. Click the "Add to Project" button to add the icon to the project.

5. In the project, you can manage, download, generate code and other operations for the icons.

6. After generating the code, copy the code into the HTML file and introduce the font file into the CSS file.

7. To use icons in HTML files, you can add the corresponding class, for example:

```html

<i class="iconfont icon-xxx"></i>

```

Among them, icon-xxx is the class name of the icon, which can be viewed in the project.

It should be noted that when using Alibaba font icon library, you should pay attention to copyright issues and comply with relevant regulations. At the same time, you should pay attention to the loading speed of the font file to avoid affecting the page performance.