There are two methods. One is that you need to open QQ Green Diamond to directly upload background music. The other is to upload your music to a website, get the mp3 link, and add it to the QQ space background music network address. The specific steps are as follows:

The first step is to search for a website on Baidu that can upload music. And get the website of the mp3 address, upload it, and get the address.

The second step is to open QQ space, click on the music box, then click on background music, and then click on add network background music, as shown in the picture.

The third step is to add the obtained mp3 address into it, fill in the song name and save it.