The boiler steel frame tends to be larger in scale and more complicated in system. Traditional 2D drawings can hardly satisfy the requirement of structural constructions. This article focuses on the imperfections of 2D drawings in expressing 3D images, and a 3D parametric modeling method for boiler steel frame is proposed. Based on the secondary development of CATIA software, the 3D models is constructed with the information given by 2D drawings. Meanwhile, a management system for engineering assembly parts is designed according to statistical methods of engineering management, by which the 3D parametric modeling for boiler steel frame is realized, the overall situation of the engineering structure intuitively embodied, the statistical management for the parts acquired, and the lofting and pre-erection outfitting for the parts are avoided .