In order to study the effect of different groove microstructures of sealing end face on the sealing performance of liquid film seal,a mathematical model considering the surface roughness was established based on the herringbone groove liquid film seal end structure.The roughness parameters were characterized by the topographic characterization (the ratio of the ratio of the involute to the radial direction) and the standard deviation of the surface roughness (the mean square deviation of the integrated surface roughness).The influence of surface roughness parameters on sealing performance of herringbone groove under different lubrication conditions was analyzed.The results show that in a mixed friction state the friction coefficient and the leakage show decreasing tendency,and the bearing capacity of the liquid film is increased with the increase of surface topography.With the increase of standard deviation of surface roughness,the bearing capacity of liquid film is decreased and the friction coefficient and the leakage are increased.In a liquid film seal state,with the increase of surface topography,the friction coefficient no longer changes,the leakage is decreased,the stiffness of liquid film seal is increased slightly and then decreased.With the increase of the standard deviation of the surface roughness,the friction coefficient does not change,the leakage and the film stiffness are increased.