Abstract: This paper introduced the function modules of EMU simulation software and the design methods of software frame, which took the software of "high speed EMU simulation system" developed by the Locomotive and Car Research Institute of China Academy of Railway Sciences Corporation Limited as an example. In this paper,the functions of EMU simulation software were divided by modular method to provide good user interface, rich configuration parameters, functions of basic data recording and analysis. The main structure of EMU simulation software was designed by object-oriented method to implement flexible software architecture, and provide rich extensibility for future simulation system development through object inheritance. Based on the data of the simulation calculation, the statistic of the running data of the EMU is in good agreement with the actual operation, which shows that the simulation system can provide an effective reference for the experiment and operation analysis of the high speed EMU.