Based on the finite element analysis software Abaqus,the rotating lip seal model was established,and the static contact pressure and radial deformation influence coefficient matrix were calculated,and then the pumping rate was calculated through the numerical calculation model of oil seal.Under certain working conditions,the effects of theoretical contact width,front lip angle,rear lip angle,interference and waist thickness on sealing performance were analyzed.Taguchi experimental method was used for orthogonal experimental design,and the signal-to-noise ratio was used as the index to measure the stability of the pumping rate,and the best parameter combination affecting the sealing reliability was obtained.The limit state equation of oil seal was obtained by response surface analysis,and the reliability of oil seal based on structural parameters was calculated by Monte Carlo method.The results show that the order of influence of various structural parameters on pumping rate is theoretical contact width,front lip angle,rear lip angle,interference,waist thickness.The sealing reliability of the studied oil seal is 0.999 87.