This paper studies the BIM digital module separation technology based on VR, the dynamic rendering technology based on physics, the secondary development technology based on Unity, and the development of BIM architecture VR interactive system based on the virtual reality engine. At the same time, the active 3D time-sharing display technology is researched to form a light and multiplayer VR display scheme. The application in the project of Shanghai Rail Transit Operation Command Building shows that, the method provided in this study is able to accelerate the design of the scene decoration deepening plan, to reduce the number of rework of the model room, and to support the application in the project deepening design process. It is of great promotion value in the field of architectural visualization.