In view of the problem that the protection standards of the existing breakwater can not meet the operational standards in the port after the changes in the functions of the port area,it is analyzed that the wave in harbor is mainly caused by the secondary wave overtopping of the breakwater,the incident wave from the entrance and its diffraction.Based on the verified hydrologic wave data,the structural stability of the original breakwater is checked,and the elevation of the top of the breast wall is checked,and the technical reconstruction measures such as increasing the elevation of the top of the breast wall and optimizing the layout of the breakwater are adopted to improve the berth conditions in the port and realize the improvement of the port functions.The top elevation of the breast wall is calculated according to the water level and wave climbing height,and determined synthetically according to the protection standard,reconstruction conditions and feasibility,while the optimal layout of the breakwater is adjusting the direction of the entrance and the length of the breakwater according to the hydrologic wave and water depth conditions at the entrance.After many times of comparison and demonstration,combined with the results of model test,this paper puts forward a more targeted technical transformation scheme,which has a certain reference significance for similar projects.