The lifting pulley is an important lifting tool. It is simple in structure and easy to use. It can change the direction of the rope drawn by the pulley and the pulley block for many times and lift or move objects in motion. Especially the pulley group composed of the pulley block, which is combined with the winch, mast or other lifting machinery, is widely used in the construction and installation operation. The specification of the lifting pulley is from 0.03 to 320t, and the gear train is from single pulley to ten pulleys. The spreader has four types: hook, chain link, eyebolt and hanging beam.