Hexagonal boron nitride dotted with copper nanoparticles as lubricating additive (Cu/h-BN) was prepared by hydrothermal adsorption and pyrolysis reduction.The as-prepared lubricating additives were characterized by transmission electron microscopy (TEM),X-ray diffccraction (XRD),thermo gravimetric analysis (TGA) and infrared spectroscopy (FT-IR).Lubricating additive was dispersed into poly α-olefin (PAO10) and the tribological properties were investigated by ball-on-disk tribo-test.SEM was used to analyze the morphology of typical wear marks,and XPS was used to analyze the chemical composition and chemical state of the deposited lubricating film,and the anti-wear mechanism of the composite lubricating additive was discussed.The results show that compared with the oil sample dispersed by hexagonal boron nitride,the interlayer slip of boron nitride at the friction interface and the repair of copper nanoparticles at the abrasion interface in the composite lubricating additive of Cu/h-BN make the PAO10 base oil exhibit better tribological properties,and the friction coefficient and wear rate are reduced by 15.4% and 29.7%,respectively.Cu and h-BN in the composite lubricating additives of Cu/h-BN can play their respective structural advantages and accelerate the formation of solid lubricating film,so as to achieve excellent tribological properties.