The friction and wear properties of fracturing pump plunger seal are the main factors that affect its working performance and service life,and biomimetic texture has been proven to improve textured surface lubrication and tribological properties.In order to improve the friction and wear properties of the fracturing pump plunger seal pair,different composite surface textures (different composite texture types,different distribution patterns,different crosssectional shapes) were established on the surface of the fracturing pump plunger seal.On the basis of the geometrical structure characteristics,pressure boundary conditions and Reynolds equation,the theoretical model of the hydrodynamic lubrication of textured fracturing pumper plunger seal was established,the influence of compound texture on the hydrodynamic lubrication performance of plunger seal was analyzed.Numerical simulation results show that compared with single texture,the further influence of compound texture on hydrodynamic lubrication is closely related to the external texture depth.For the compound textures that the inner texture is pit or bump and the crosssection has different shape,they mainly affects the relationship between the average texture depth and the clearance of the friction pair,thus resulting in different effects of hydrodynamic lubrication performance.When the inner texture is distributed on the right side of the external texture(the inlet side of the lubrication media),the hydrodynamic lubrication performance of compound texture is greatly improved.