The purpose of this study is to consider the characteristic of residential life and space in Cohousing and the harmony of privacy and community in it. First consideration is to figure out concepts and case studies of Cohousing. Then, the harmony(of privacy and community) in Cohousing is evaluated within two domains, namely, domestic life and residential space. Consideration of such harmony(of privacy and community) in domestic life focuses on community relations as they manifested, that is, in traditional neighbours roles of caring, and mutual support and in community roles of active participation, common meal and share. Consideration of such harmony within residential spaces is based on the role of Common House, pedestrian traffic and shared outdoor areas. By these means, Cohousing demonstrates new possibilities for a more harmonious residential environment.