Abstract: New ionic liquids were prepared by the way of in-situ formation between lithium salts and polyether（PAG） and used as lubricating grease additives. The electricity compound grease was prepared by mixing PAO40 base oil with traditional or the new ionic liquid and a thickener polytetrafluoroethylene (PTFE). The conductivity and tribological properties of traditional ionic liquid and new ionic liquids as additives were studied. It is observed that the addition of additives reduces significantly the volume resistivity and contact resistance of the electricity compound grease, but the conductivity and that the scar width and the friction coefficient are both reduced, reflecting the excellent antifriction and anti-wear performance of the greases adding the additives. The improvement of tribological properties should attribute to the formation of the chemical reaction ?lm due to the reactions of anion of the additives with metal surface. The results demonstrate that the new ionic liquids which are easily prepared can significantly improve the electrical conductivity and tribological properties of the grease.