The 300 000 DWT floating dock project of Dalian COSCO Shipyard is located in the south-east of the plant, which is to build a 300 000 DWT floating dock, a 300 000 DWT ship-repairing pier and a breakwater. The general layout plan has solved the problem of limited water area with the other company’s harbors, the proper use of the coastline, the reasonable axes of the breakwater, and also the optimization of its length. The pier adopts the caisson gravity structure which is of rich construction experience, while the breakwater adopts the innovated perforated caisson structure, which can resist the sea wave effectively, and make the structure reasonably stressed. Rock-socketed piles are used for the first time as the anchoring of the floating dock, and the“Zhang method”is chosen to calculate the internal forces, which makes the resistance coefficient a constant.