Tools/materials: creat wallDH98L, Windows 10 Professional Edition 19042.1288, Microsoft PowerPoint2010.

1. Open the PPT file on your computer and enter the main editing interface.

2. Then click the "Insert" option in the upper menu bar and click the "Sound" icon in its page option.

3. Click the "Sound in File" option in the drop-down box of "Sound".

4. Then select the target music file in the pop-up window, and then click the "OK" button.

5. After completing the above operations, you can add background music to the PPT.