The domestic housing market is facing conflicts between population concentration and the rise of housing scarcity, between rising house prices and decreasing residential utilization, between residents'higher demand for communication and public space scarcity, between resource and environmental constraints and higherrequirements of living convenience. In order to solve theseproblems,based on the survey method, and combining experience summing-up method with descriptive research method, this paper has analyzed the advanced concepts and methods of the domestic and foreign residential public space design, and has put forward the following trends of residential public space expansion: subdivision of family structure, differentiation of the public space design, a better utilization and planning of the platform and corridors. At the same time, the supporting policies and suggestions are presented in the paper to meet the trends.