This paper introduces the structure and application of the gantry tail sliding system which is combined with the compound door lifting equipment. The system is remotely controlled by the central control room and collaborates with the compound door lifting equipment to lift the devices or components that need to be installed upright. It has the ability of lifting, lowering and crawling. At the same time, it has auxiliary deviation correction and tail-cable wind pulling device, which can effectively cooperate with the main door lifting heavy equipment to carry out lifting operations.