Abstract: The EMU repair workshop is an important place for high-speed train maintenance and inspection. This paper took an EMU repair workshop as the development object, in view of the complex structure of equal proportion 3D repair workshop model, carried out the simplified modeling of the research object, and then imported it into Unity3D for system development; adopted collision detection technology, C# script language and database management technology to implement information management and reading; used NGUI plug-in to carried out the virtual and digital design of train maintenance workshop building and equipment, and established the virtual maintenance workshop roam system. The system has a strong sense of reality, strong interaction and other characteristics, which can make the experience quickly understand the structure and operation process of the maintenance workshop, and plays an important role in the training of relevant personnel.