To improve the tribological properties of rolling mill bearing grease,the grease was modified with different mass fraction of graphene.The penetration and drop point of each grease sample were measured,the influence of graphene on the tribological properties of the grease was studied on the four ball friction testing machine,and the friction reducing and anti-wear mechanism of graphene in the grease was analyzed by scanning electron microscope,white light interferometer and Raman spectrometer.The results show that the graphene can improve the drop point,the extreme pressure performance and the properties of friction reducing and anti-wear of the grease.When the mass fraction of graphene is 0.2%,the best improving effect is got in the extreme pressure performance of the grease,and the sintering load and comprehensive wear value are increased by 29.0% and 24.0% compared with the base grease,respectively.When the mass fraction of graphene is 0.3%,the best improving effect is got in the properties of friction reducing of the grease,the friction coefficient and wear spot diameter are decreased by 22.4% and 13.0%,respectively,and the wear volume is decreased by 43.0% and the maximum non seizure load is increased by 21.2% compared with the base grease.During the friction process,graphene is attached to the friction surface and forms a protective film,which prevents the direct contact of friction surface,reduces wear and improves the carrying capacity of the grease.