The reciprocating skeleton oil seal used for automobile shock absorber seal was taken as the research object.Based on the lubrication theory,the numerical simulation model of fluid lubrication in the sealing interface was established to analyze the sealing performance of reciprocating skeleton oil seal.The model was coupled with solid mechanics,fluid mechanics and deformation mechanics analysis.The static contact pressure of sealing zone was extracted by ANSYS finite element for solid mechanics analysis.The Reynolds equation was solved by over relaxation iteration method for hydrodynamics analysis.The influence coefficient method was adopted to solve the deformation of sealing lip.The microasperity shape of sealing lip was assumed to have sine and double cosine distribution.The influence of microasperity shape distribution and reciprocating speed on the film pressure and thickness was analyzed based on the model.The results show that the the film pressure during the instroke is greater than that during the outstroke under the two different forms of microasperity shape of sealing lip.When the microasperity shape of sealing lip is distributed as sinusoidal function,the leakage appears in the lip of the reciprocating skeleton oil seal.When the microasperity shape of sealing lip is distributed as double cosine function,the reciprocating skeleton oil seal has good sealing performance.