At present,the large power grid based on Ultra High Voltage technology has been officially put into use.Because its backbone grid is different from the traditional power grid,the conventional human patrol operation and maintenance mode is not applicable,so it is urgent to optimize and upgrade the operation and maintenance mode.Taking airborne laser scanning technology as the research object,this paper expounds the principle,advantages and specific applications of this technology.This paper mainly analyzes the steps of airborne laser scanning technology in data acquisition and processing,and points out the outstanding role of this technology in detecting defects,analyzing working conditions,analyzing tree species and warning hidden dangers,so as to provide help for relevant practitioners and facilitate the operation and maintenance of transmission lines in the future.