Diamond like carbon (DLC) coating is widely used as lubricating protective coating for mechanical parts due to its high hardness,high wear resistance and low friction coefficient.However,the traditional DLC coating is prone to increase friction coefficient,crack,bulge/peel and fall off from the substrate under harsh working conditions such as high speed,heavy load and high temperature,which leads to the failure of the coating.Based on process control and substrate treatment,the optimization measures to improve the service performance of DLC coating were reviewed from the aspects of coating deposition process, element doping, transition layer addition,nitriding and carburizing,changing surface roughness and machining surface micro texture.The measures to improve the service performance of DLC coating were analyzed theoretically,and the future research directions were proposed,such as establishing a standardized and unified preparation process and performance characterization method of high-performance DLC coating, and further discussing the influence of different substrate roughness on the mechanical meshing force of the coating,the size effect of micro texture and the thermal stress release effect of DLC coating.