1. Prepare the hardware first: a computer+a piece of green cloth (unnecessary, camera foreground matting is not green cloth, and green screen matting is cleaner), and the software: live companion (note: the software is obs officially developed by Tik Tok, which is completely free and doesn't cost a penny), and download the link.

2. Second, open the virtual live broadcast software of the live broadcast partner.

3. Finally, add a virtual scene background (there are many options, just choose the function you want to realize and then add it to the scene on the left).