Based on the diatom structure,the rectangular-spherical compound dimples were designed on the surface of water-lubricated bearing.The tribological characteristics of water-lubricated bearings with rectangular-spherical compound dimples at different textural position angles and textural spacing were studied by the fluid-structure coupling method,and the lubrication performances were compared with those of smooth bearing and single textured bearing.The results show that the friction and friction coefficient of composite dimple bearings are always smaller than those of single dimple bearings and smooth bearings,and the maximum water film pressure of composite dimple bearing is greater than that of single simple bearing when the dimple position angle exceeds a certain angle from 225° to 45°.Under different spacing conditions,with the increase of dimple position angle,the maximum water film pressure of composite dimple bearing increases first and then decreases,and the friction coefficient decreases first and then increases.When the dimple spacing is 5° and the dimple position angle is 45°,the tribological characteristics of compound dimple bearings are the best.