Abstract: In order to clearly grasp the flow direction of dust in the equipment compartment of EMU in extreme temperature and severe wind environment, the numerical calculation method of train aerodynamics is used to study and analyze the flow field in EMU equipment compartment under different severe wind environment and high temperature conditions. Through the analysis and comparison of the flow direction of pressure field and velocity field in EMU equipment compartment, the change of flow field in EMU equipment compartment at different train speed and under different wind speed conditions, and the influence of bottom hole on flow field in equipment compartment are obtained.