Considering the influence of the heat generation mechanisms by friction and hyperelasticity theory on the temperature field of the rotating shaft lip seal, the temperature distribution of the oil seal under specific working conditions was simulated.The threedimensional finite element model of lip seal was established by using the finite element analysis software ABAQUS.The unsteady temperature field of a lip seal before and after optimization was simulated and the relationship curves between pressure,speed and oil temperature were obtained.The simulation results show that the temperature field distribution of the rotary shaft lip seal before and after optimization satisfies the sealing requirement. In the range of the analyzed parameters,the temperature of the seal ring is decreased with the increasing of the pressure,and increased with the increasing of the rotational speed.The temperature on the friction surface is increased gradually from the two sides to the middle, and the maximum temperature appears at the center close to the air side.The change of temperature of the optimized oil seal tends to be smooth with the increasing of the rotational speed and the pressure,which proves that the optimized oil seal has better sealing performance and heat dissipation performance.