Combining the finite element method of global network reconstruction with the numerical calculation model under lubrication,the variation trends of sealing performance parameters such as lip profile,contact pressure,maximum contact pressure,pumping rate and friction torque during the wear process of oil seal under lubrication were analyzed.The simulation results show that the wear of oil seal can be divided into two stages.The first stage is the initial wear stage,in which the wear rate of lip is large,and the maximum contact pressure also shows a large downward trend.The second stage is the stable wear stage,in which the wear rate is small,the wear amount is small,and the variation trend of maximum contact pressure tends to be flat.The wear degree of lip contour tends to be gentle with the increase of wear time,and the wear degree on the air side is more serious than that on the oil side.The pumping rate shows a trend of decreasing first and then increasing,indicating that the wear will lead to the loss of lip tip material and the instability of oil seal sealing performance.The friction torque shows an upward trend due to the combined influence of the radial force caused by wear and the shear action of lubricating oil.