▎ 摘　　要

NOVELTY - Lubricating oil comprises lubricating grease and multiple nano-graphite sheets dispersed in the lubricating grease in weight ratio of 0.0001-10 wt.%. The graphene sheet has length or width of 1-100 mu m, thickness of 10-100 nm, and comprises n graphene layers stacked on each other and at least one surface modified layer, and the surface modification layer where n is 30-300. The surface modification layer includes surface modifier comprising functional groups at end of the surface modifier. USE - Used as lubricating oil. ADVANTAGE - The lubricating oil exhibits good thermal conductivity. DETAILED DESCRIPTION - Lubricating oil comprises lubricating grease and multiple nano-graphite sheets fully dispersed in the lubricating grease in weight ratio of 0.0001-10 wt.%. The graphene sheet has length or width of 1-100 mu m, thickness of 10-100 nm, and comprises n graphene layers stacked on each other and at least one surface modified layer, and the surface modification layer is set on upper most and/or lower most surface of stacked graphene layers, where n is 30-300. The surface modification layer includes surface modifier comprising at least two functional groups at the end of the surface modifier, where at least one functional group within the graphite thin layer surface is organic functional group to produce chemical bond, and other functional group forms surface property of nano-graphite sheet.