In order to support repair and maintenance of CRH380BL high-speed EMU bogie, the authors used virtual reality, multimedia and simulation technologies in developing an EMU bogie overhaul virtual simulation support system. It provided a multi-media platform that enables trainees to quickly master the maintenance skills and provides assistance for repair and maintenance as well as a visual channel for communication in other relevant occasions. After a brief introduction of the bogie structure, the paper describes in detail the key technologies for interactive three-dimensional model browsing, virtual assembly simulation, multimedia information integration, interactive techniques and data compression.