The specific steps are as follows:

1. Open Tik Tok software, select your favorite video, and then click the forward sign in the lower right corner.

2. Click the "Dynamic Wallpaper" button after entering the interface, and Tik Tok APP will automatically convert the video into pictures and save them in the mobile phone photo album.

3. Then open the phone settings, enter the page, find the "wallpaper" option, and click Enter.

4. After the wallpaper interface is included, find and click the "Select a new wallpaper" option.

5. Finally, open "Live Photo", select the photo you just saved, and then set it as wallpaper.