Luffing crane is the typical rail-traveling crane with slewing boom, which is widely applied to the quays and ports for the cargo loading and unloading, the construction and installation of the shipyard, and the large-scale hydropower station construction. It has great work performance and unique structure with good commonality, which can satisfy the mechanical loading & unloading, transferring of the cargo on the quay, port, shipyard and hydropower station. At the same time, it can fully take advantage of the construction site to meet the access requirement of vehicles, withhigh flexibility and reliability.