To improve the lubrication performance of water-lubricated graphite bearings used in nuclear main pump canned motor,the dimple textures with different shapes,depths and area rate were processed on the surface of graphite specimens using high-speed engraving and milling machine.The influences of dimple texture parameters on water lubrication performance of graphite material were tested using a pin-on-disc friction and wear machine.Results show that the dimple texture has a certain friction reducing effect under water lubrication conditions.With the increase of rotating speed,the dynamic pressure effect of dimple texture is increased and the friction coefficient of graphite specimens is decreased.With the increase of load,the friction coefficient of graphite specimens is also decreased.The friction coefficient is first decreased and then increased with the increase of dimple depth to diameter ratio and area rate.When the dimple depth to diameter ratio is 0.5 and the dimple area rate is 3%,the friction coefficient is the minimum.Compared to triangle dimple texture,square dimple and circular dimple textures have better friction reducing effect.