Fixed-column cantilever cranes are divided into manual and electric according to the rotation mode, and can be divided into 270 degrees and 360 degrees according to the rotation angle. Users can first determine the lifting weight, lifting height and cantilever length, and then select the rotation method and rotation angle. Usually, the cantilever structure is an upper-supported cable-stayed type. If the user's space is limited, a lower-supported type can be used. Using a low headroom hoist can increase the lifting height.