Abstract—In recent years, building industry in China is experiencing upgrade and industrialized building becomes a hot issue. Modular steel building, as one of the most promising types of prefabricated structures, can save construction time, improve quality, and reduce resources and waste. It can be expected that modular steel building will have vast potential for future development in China. Firstly, this research proposes the size selection method of column-supported modular steel building based on the architectural requirements and the transportation limits. The dimensions for individual module are selected as 6 meters for length, 2.4 meters for width and 3 meters for height. Furthermore, the architectural adaptability of column-supported modular steel building is studied with respect to dormitory building, office building, school building and residential building. The results indicate that the column-supported modules with selected dimensions have acceptable applicability with respect to the four types of buildings.