Abstract: Prefabricated construction is the construction technology vigorously promoted by the state, and its application in curtain wall engineering is also of great significance. BIM technology is widely used in decoration engineering, but rarely in large-scale special-shaped prefabricated cornice curtain wall engineering. Based on the research on the curtain wall project of Xiong′an business service center, combined with the difficulties of actual construction, this paper applies the prefabricated design concept to the cornice area in the overall BIM application, which provides important technical support for the actual engineering construction. At the same time, BIM combined assembly design method has reference significance for other special-shaped curtain wall assembly projects.