Abstract: By using combination of the porous media one-dimensional "porous jump" model and the standard k-ε equation models, the airflow angle of the top side grille air outlet, the position of the top side grille air outlet and the air speed at the air outlet in the passenger compartment were studied. Through simulation, comparative analysis of thermal comfort index PMV (predicted mean vote) and PPD (predicted percentage dissatisfied) at a typical section were conducted. The conclusion is that the air outlet on the upper grille side of the passenger compartment is recommended to be staggered from the air outlet on the top grille of the passenger compartment. The direction of the grille is at an angle of 45 ° to the train floor horizontal plane, and the air velocity of the air outlet is 1 m/s.