In order to study the thermal comfort of loader cab,the finite element model of the cab was established by using CFD technology,and the indoor flow field was numerically simulated to obtain the air distribution of temperature field and velocity field.The accuracy and rationality of this model were verified by comparison between simulation and experiment.Based on this model,a method of compiling PMV-PPD,air age and blowing feeling evaluation indexes by UDF was proposed to visualize the thermal comfort of the cab.The results show that under the set environmental conditions,the PMV value of the driver’ s surface is about -0.55~0.35,and the PPD value is concentrated in the range of 5.5% ~ 12.5%; the blowing sensation index (DR) is in the range of 11%~13%,less than 15%,and the human body will not have a strong blowing sensation; the indoor air age is basically kept at 35 s,indicating that the air quality is good.