ABSTRACT: concrete filled steel tubular (CFST) special-shaped Column Composite Structure System is a new type of fabricated steel structure developed by Dayuan Jianye Group Co. , Ltd. and Tianjin University, through the perfect completion of the public rental housing of Fukang home in Cangzhou City, we have obtained the summary and innovation of the key construction technology of the composite structure system of concrete filled steel tubular special-shaped columns, which can provide reference for similar projects.