Abstract: The energy consumption of EMUs has an important impact on the operating costs of EMUs. Based on the analysis of the influence of complex line data, vehicle parameters and operation model on traction energy consumption, this paper established a reasonable simulation model of traction energy consumption, as well as static and dynamic simulation data management mechanism. Considering the needs of two types of users:rolling stock factory and railway administration group company, the paper designed and developed traction energy simulation system of EMU. The front end of the system was based on the layui framework with integrating jQuery and Highcharts. The backend was integrated with SSM architecture. The system is not only easy to operate, use, maintain and expands, but also has high scalability and reliability. The example shows that the system can provide effective support for analyzing the factors affecting the energy consumption of the EMU and quickly estimating the energy consumption of the EMU.