Abstract: The cold-formed thin-walled steel structure residence is widely used in low-rise light-steel structure residence with rapid construction demand because of its light weight, small seismic response and high installation accuracy. However, due to the limitations of the relevant structural modeling and calculation software in the industry, the design of cold-formed thin-walled steel structures has always remained at the two-dimensional design level. This paper has innovated the secondary development plug-in based on Revit2017, and realized the BIM positive design of cold-formed thin-walled steel structures for the first time in the industry, and integrated a full-professional collaborative design platform with automatic modeling and structural calculation. Through the function-based modular house design, the industrial product thinking is introduced in the design stage. Considering different living needs, the functional spaces e.g. bedroom, living room, kitchen and bathroom are designed into several standardized functional modules, which form a diversified flat through module combination. An open modular database suitable for each functional space of cold-formed thin-walled steel composite wallboard houses has been initially established, which provides a basis for deepening architectural design and standardization of wallboard splitting. Integrating the BIM intelligent building system and compiling the algorithm according to the specification requirements, the intelligent production of light steel keel has been realized in the design stage by realizing the functions include: rapid keel generation and 3D modeling, generation of calculation sheets and design drawings, deepening of details and calculation, docking of production and manufacturing equipment and automatic transmission of production and manufacturing data.