1. First, open Baidu search engine, enter the word "Web of Science", click Search, find the word shown in the picture in the search results, and then click Enter.

2. After entering the homepage of Science Network, enter the keywords of the paper to be retrieved in the search bar, and then click Search.

3. In the search results, find the title of the paper you want to query, and then click the title of the paper.

4. Find the corresponding button in the position shown in the figure, and then click to select the "Save as Other File Format" option.

5. In the pop-up dialog box, we select the file format to be sent as "HTML" format, and then click "Send" button.

6. Next, select the location to save. Remember, it must be a place where you can find it.

7. The last step is to open the saved "HTML" file and find the number after the last line of "UT WOS", which is the [index number] of the document.