Abstract: Objective: In hot summer weather, uneven temperature distribution inside metro passenger compartments is a major issue reflected by passengers. Therefore, it is necessary to study the impact of metro compartment environmental temperature on human comfort level. Method: The average temperature and humidity values of strong and mild airconditioned compartments (hereinafter referred to as HLcool and LODcool) on 7 metro lines are measured and analyzed. Compartment models are established with defined boundary conditions. Based on the fieldmeasured data of metro compartment environmental temperature, CFD (computational fluid dynamics) method is used to analyze the human comfort level at four typical sections in metro compartments for the PMV (predicted mean value) thermal comfort evaluation index of passengers with high and low metabolic rates under different environmental temperature conditions. Result & Conclusion: The temperature inside HLcool compartment is approximately 23 ℃ while it is approximately 26 ℃ in LODcool compartments. The temperature difference between the two compartments is around 3 ℃, and the temperature in the same compartment also fluctuates up and down at 2-3 ℃. The comfort rate of passengers with high metabolic rate have a higher comfort level within the temperature range of 20.7-22.0 ℃, with the highest comfort level reached at 22.0 ℃, resulting in an overall comfort level of 41% in compartment. For passengers with low metabolic, the higher and highest comfort levels are 23.0-24.3 ℃ and 24.3 ℃, resulting in an overall comfort level of 42% in compartment.