For people boarding & disembarking safely and favorably during oil tanker operating at modern size oil dock.        The gangway is an equipment for people boarding & disembarking saftly and favorably during oil tanker operating at modern size oil dock. The conventional boarding at accomplish the purpose by accommodation ladder of tanker. During the development of oil dock, latter-day size oil dock, specially naked pier, dock surface is discontiguous and too high in elevation, the ship bump and drift continually and strongly during operation. Distance between the shipboard in berth and the edge of dock is too long because of the large fender, in this condition, it is difficult to settle the contact between ship and dock with accommodation ladder. Therefore in modern size oil dock, it is a necessary choice to adopt gangway to replace accommodation ladder so as to accelerate loading work of tanker and ensure that people is safe during boarding & disembarking. The gangway almost become a necessary size equipment same as marine loading arm at oil dock.