Since the completion of the navigation lock of the Three Gorges Dam,the navigation conditions of ships in the reservoir area have been significantly improved,the upsizing of ships has been developed rapidly.The carrying capacity of the mooring facilities in the ship lock is limited,however the large-scale development of the ship should meet the requirements of safe berthing of the lock chamber.By ship trail，we measure the mooring state and corresponding numerical values by choosing typical large-scale cargo ship passing through lock,analyze the major factors of affecting the lockage mooring force,and present effective measures to improve the berthing safety of vessel lockage.