Abstract: With ANSYS Fluent software,taking the whole metro cabin as the calculation model,the RNG k-ε turbulence model is used to simulate and calculate the airflow organization in the metro cabin under different inlet vent angles. The simulation results are analyzed from four aspects:temperature field,velocity field,flow field vortex structure and PMV index. The results show that the 60° split inlet vent angle can best meet the human thermal comfort requirements;the top air supply can create a vortex structure in the metro cabin,and the inlet vent angle affects the formation of the vortex structure and the spread of pollutants. Research results provide reference for the optimization design of airflow organization of metro cabin.