It can be argued that street space is the most important public open space for numerous citizens’ daily lives in each city. It also plays a significant role for a city image. The image of street space becomes very important. The image of a street space mainly results from all of the buildings erected on its both sides. The order of form configuration of buildings becomes the key element. The pros and cons of buildings’ form configuration are closely relevant to their control mechanisms. In the urban expansion process of Taichung city, the urban planning and control tools applied to both the early and late stage planning districts including commercial and residential areas etc. were various. It then brings about a discernible image of street space between the early and late stage planning districts. The paper investigates the form configuration of street space in residential areas of the city. Zoning adopted as the planning and control tool of the early stage planning district has little effect on regulating the order of form configuration of street space. The image of most streets is chaotic. Zoning control is adopted as the planning and control tool of the late stage planning district. The application of bulk rate prompts flexibility of building mass design, yet it seems not good enough to shape the form configuration of each street space with order. The image of some streets looks disorderly. These facts reflect that it lacks some kind of effective control tool or mechanism for urban space in both the early and late stage planning districts. From the viewpoint of residential buildings as urban basic texture, the research suggests the strategy that form-based code may be adopted as a control tool for all residential areas' planning of the city in the future. The content of form-based code should be regulated in accordance with the local context. In doing so, an orderly image of street space appearing in residential areas in the future could be expected.