It’s the interantioal railway transportation trend in decades; the railway transportation system provides the passengers delivery service from airport area access to the main city area. The airport express is mainly provide the international business traveller a reliable transportation service to access from/to the airport area, such as Japan Narita Express, Hongkong airport express, etc. The airport express is basically using the unique railway access right and will not be affected by the roadway traffic. Taiwan government had approved the TTY International Access MRT system development project after many years schedulded and planed. Based on the above study background and motivation, the purpose of this study is considered and planed according to the TTY International Access MRT EMU maintenance system. To realize the planning of the EMU maintenance requirement model so that the EMU maintenance requirement estimated model will be the basis for the relevant EMU maintenance facilities and equipment to be allocated in the depot.