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The general design and layout of the double-line five-step ship-lock, the water delivery technique for high head ship-lock, the key technical problems of fully lined ship-lock and the monitoring techniques for large-scale miter gates and hoisting equipment under complicated operation conditions of Three Gorges Project （TGP） are introduced. Since the operation of ship-lock in 2003, the operation practice has proved that the design techniques are advanced, rational and reliable. The design and construction of the fully lined ship-lock promotes the development of design theory and practice of ship-lock projects, which makes the construction technology of ship-lock in the world reach a new level.