The contact Cauchy stress and contact width of oil lip seal were simulated by finite element numerical simulation,and the oil film thickness was calculated.A two dimension CFD numerical model was built to simulate the temperature field of oil seal with considering the effects of thermal conduction and dissipation of oil seal rubber,and the simulated results were verified by infrared temperature measurement experiments.The results of CFD simulation show that the heat production rate,the maximum temperature of the seal lip and the maximum temperature difference between oil seal lip and shaft surface are all increased with the increasing of shaft speed.The heat production rate and the maximum temperature difference between oil seal lip and shaft surface are reduced with the increasing of oil temperature,but the maximum temperature of the seal lip is increased.The effect of oil temperature on oil film thickness is larger than that of rotating velocity of a shaft,while the velocity is the main factor influencing the maximum temperature of an oil lip seal.The mechanism of thermal generation by friction and thermal dissipation can be shown more truly when considering the effect of thermal conduction and dissipation of oil seal rubber.The difference between infrared temperature measurement experiment results and CFD simulation results is less than 2%,indicating the temperature field simulated agrees well with the actual temperature field.