Residential area mode of China originates from "neighborhood unit" and "unit compound", they are isolated from the city and known as "islet" and "fragment". The isolation of residence from city breaks the urban structure, increases scale of blocks, and aggravates urban traffic and other problems. In view of this, it is imperative to explore the ways of designing "friendly neighborhood boundary spaces" between residential areas and the city, for example, by extending urban street spaces inward, opening boundary spaces of residential quarters to the city, constructing a boundary space network of residential areas harmoniously integrated into street life.