Regarding the difficulties in coordination of 2D design professions, such as low visualization, difficult understanding of reporting and inconvenience of off-site communication, this paper explores an integrated application of BIM+GIS data in scheme decision making to form a low-cost, high-quality digital design system and promote the scientific nature of scheme decision making. Taking advantages of high rendering of the game engine, the paper integrates 2D data, BIM, GIS, lighting, greening and realistic 3D data to develop a high quality scheme collaborative reporting system, which realizes scenario applications such as visualization of expropriation and demolition analysis, multi-disciplinary collaborative design and dynamic scheme comparison. Applied in the Langu to Jiaodong International Airport Expressway Project, this system is built for efficient data production and focuses on the multi-source data integration by using scenario integration application to obtain digital scheme decision and finally achieve high-quality digital scheme design, which improves the efficiency of collaboration and communication between various parties involved, enhances the quality of engineering construction, and further promotes the application of digital design both in traffic engineering and on the ground, and lays the foundation for promoting the digital transformation of transportation.