1. First of all, video content: You must first understand the theme, emotion and atmosphere of the video you want to select, and then you can better select the music that matches the video to achieve the purpose of making the video.

2. Secondly, music style: The choice of music style should be coordinated with the video content, and there should not be too much contrast to avoid affecting the look and feel.

3. Finally, music emotion: The selection of music emotion should be consistent with the emotion conveyed by the video information.