You can use the alarm clock setting function on your iPhone to select the song you want as an alarm clock. The specific steps are as follows:

1. Open your iPhone, enter the alarm clock setting page, and click on the upper left corner "edit".

2. Select an alarm clock you want to set a ringtone for.

3. On the settings page, select the "Ringtone" option and click to enter.

4. On the "Ringtones" page, there are some system default ringtones. You can choose these songs as alarm clock ringtones or click "Select Songs" to select the songs you want from online songs as alarm clock ringtones. , select and click Save.

Note:

Don’t use your favorite song as the alarm clock ringtone, otherwise your favorite song will become the most annoying song.