The static contact pressure distribution in the main lip area of the double lip oil seal was simulated and analyzed by finite element analysis software,and the static contact pressure was compared with that of the single lip oil seal.The displacement and deformation of the minor lip after the installation of the double lip oil seal were analyzed.The results show that the sealing effect of the main lip area of the double lip oil seal is lower than that of the single lip oil seal due to the different waist structure of the oil seal,and the displacement and deformation of the minor lip cause the gap between the minor lip and the rotating shaft during actual operation,which affects the dustproof effect.In order to improve the performance of the lip seal,an optimized scheme was proposed,in which the the original bow waist structure was replaced by progressive waist structure and a long dustproof minor lip was adopted.The results show that the main lip contact pressure curve of the double lip seal after adopting the progressive waist structure is closer to that of the single lip oil seal,and the sealing effect is better than that of the ordinary double lip seal.By adopting a long dustproof lip and ensuring that there is a certain interference between the dust lip and the rotating shaft during installation,which can make the dustproof lip keep contact with the rotating shaft after the oil seal is deformed,so the gap between the dustproof lip tip and the rotating shaft is reduced,and the dustproof effect can be effectively improved.