Aimed at the lubrication problem between the contact surfaces of the seal ring,based on the Reynolds equation and considering the influence of roughness,a mathematical model of the surface texture of the truncated cone at the hydrodynamic lubrication state was established.The lubrication film pressure and distribution on the contact surface of seal ring under different texture parameters and roughness parameters were studied.The finite difference method and Newton iteration method were used to study the influence of the geometric parameters and roughness parameters of the truncated coneshaped micropits on the average pressure of the lubricating film under different lubricating media,and the results were compared with theoretical numerical results.The results show that the average film pressure of the sealing end face is decreased with the increase of the distance and small diameter of the truncated coneshaped texture,and increased with the increase of the large diameter of the texture.There is an optimal texture depth to maximize the average film pressure of the lubricating film.The greater the viscosity of lubricating media,the greater the average film pressure on the end face of the seal ring.The higher the roughness peak height,the smaller the average film pressure,while the roughness peak wavelength has small influence on the average film pressure,so the roughness peak should be as small as possible.There is an optimal combination of texture parameters and roughness parameters to maximize the average pressure of the lubricating film.