The sealing performance of rotary shaft lip seal under both static and dynamic states were simulated and analyzed using ABAQUS software.The twodimensional finite element model for oil seal under static conditions was established through the modeling method of axial pushing,and the effect of the interference fit,the spring stiffness coefficient and the theory contact width with or without spring on the static sealing index such as contact pressure and contact width were also analyzed.The threedimensional finite element model for oil seal under dynamic conditions was established,and the influences of the rotational speed and the friction coefficient between the lip and the shaft on the friction force and friction torque of oil seal were analyzed.Analysis results show that with the same interference fit,the sealing performance of oil seal with spring is higher than that without spring,and the sealing performance is improved along with the increasing of spring stiffness coefficient,but reduced with the theory contact width increasing;the friction torque for seal is increased with the increasing of friction coefficient,but is not affected by the changing shaft speed.