Abstract: The deep integration of BIM and GIS is the core driving force for the digital transformation of the construction industry. However, there are still significant technical bottlenecks in large-scale data loading, lightweight rendering and autonomous controllability, which restrict the deep integration of digital twin and business scenarios. This paper proposes a domestic independent controllable BIM+GIS graphics engine solution. By using multi-source heterogeneous data fusion, distributed GPU acceleration, dynamic scene scheduling and dynamic effect enhancement, a cross-platform efficient rendering architecture is constructed. The real-time rendering efficiency of large-scale scenes is significantly improved by using HLOD technology and GPU acceleration. With the help of soft shadow, HDR, dynamic water surface simulation and particle effect, the realism and visual expression of the scene are enhanced. After testing, the graphics engine can carry more than 10TB model data, 100 million+components and 100 billion+triangles. The running frame rate can reach more than 60 fps, and the data response time is less than 5s. The proposed technology has wide promotion and application value in the field of construction engineering.