Abstract: By analyzing the thermal comfort index of PMV-PPD (predicted mean vote-predicted percentage dissatisfied), based on the train interior environmental parameters in summer, the relationship between air temperature and passenger metabolic rate in the most comfortable thermal environment is obtained. It is found that the temperatures required by passengers with different metabolic rates to reach the most comfortable states are different. The average dissatisfaction rate of passengers decreases after the metro train adopting the air-conditioning setting mode of one train with multiple temperatures. Taking metro in a certain city as an example, the average dissa-tisfaction rate of different distribution schemes of strong and weak cold compartments is analyzed. Results show that the average dissatisfaction rate of the whole train is the lowest when the first three compartments are strong cold and the last three compartments are weak cold.