This study aimed to explore the public space of the Taipei Main Station underground street adaptive re-use of the relationship between the youth activities. In view of the way young people to use in recent years, the increase in the case of public open space of the Taipei Main Station underground street and from adolescents hip-hop sub-culture and the interaction of the station and open space perspective, to understand young people is how to combine the spirit of place of the station underground street to youth activities point of underground street public space reorganization, creating new spatial structure, order and structure characteristics, including by recognized way to change underground street function and nature, and thus reorganization of people on the underground street impression, change of underground street perception and public of Reformation.