The effect of the multistage pore structure of biomimetic diatoms,which is the combination of rectangular and spherical texture,on the lubrication performance of parallel slider was studied.By establishing a single element model of rectangularspherical compound texture,the friction and lubrication properties of two sliding surfaces with different area ratio and texture depth were analyzed by using the method of bidirectional fluidsolid coupling.The results show that the friction coefficient of textured surface decreases with the increase of area ratio,and the bearing capacity first increases and then decreases with the increase of area ratio.The area ratio of the rectangularspherical compound texture should be controlled between 25% and 36% under the condition of considering the friction property and bearing capacity.Under the condition of determining the appropriate area rate,the influence of vortices produced by different texture depths should also be considered.