Along with the leapfrog development of water transportation industry, excellent port sites are less and less, so the new ports tend to be built in the areas with strong wave and deep water. So it is an important issue to seek a way of guaranteeing the port operation conditions for the port construction in the new period. Huaneng Haimen power plant was built in the odious conditions. Although the original layout used the double surrounding breakwater, it can’t meet the berthing demand. By optimizing the axis of the breakwater, the structure of the breakwater head and the partial excavation, the wave height inside the basin reduces prominently, and thus meets the demands of port operation.