Abstract: The air conditioning and ventilation system of a metro vehicle is taken as the research object, the average temperature and the breeze speed of air flow are simulated when the ambient temperature is 33 ℃ and the passenger compartment is empty. The simulation results show that when the passenger compartment is empty, the average temperature is 24.37 ℃ and the maximum wind speed is 0.28 m/s, all meets the requirements of the EN 14750 standard. The simulation results are comparatively analyzed with the air conditioning test data of a real vehicle, and the accuracy of simulation analysis is verified.