The study takes the young group who is between 15 and 30 years old as the research object. First of all, using the In-deep Interview gets the general information of preference, needs, and etc. of music mobile phone. And then lifestyle analysis was used to separate young group into 4 groups in order to find out the difference between each group. Young group usually choose music player by the reasonable price and convenience. Music mobile phone is in the 3rd place of music player frequently. “The group 4” prefers to use music mobile phone to listen music more than the others. And the younger the age is, the more people prefer to use music mobile phone. By observation of operating the functions which are frequently used of music mobile phone, we can understand the users’ behaviors more and find out that “visibility” is not good enough to let people know what to do next. There is a serious interface problem, especially in making ringtone and connecting Bluetooth earphone. And the designers should consider the “mapping” between keys and the screen when separating the music access key. In the end, by using the Focus Group Interview to discuss the issue about making ringtone, it comes to conclusions that vocal mode or composing the melody boxes is easier for young group to make the ringtone. And using “mood” to replace “style” is much easier for young group to understand how to do the arrangement.