The top elevation of breakwater is one of the main factors of breakwater construction cost under certain geologic condition and breakwater cross section type.Analyzing the Concession Agreement and Employer’s Requirements[WTBZ] for the breakwater,and considering the landscape requirements,we determine that the breakwater top elevation shall be between 3.0～4.0 m;Analyzing the natural conditions and design elements of the engineering area,we determine the structural type of the breakwater;Under the allowable wave overtopping,we calculate the the scope of breakwater’s top elevation;By 2-D stability physical model tests and 3-D physical model test,we verify the stability of armor blocks and the artificial beach’s sediment change,and measure the wave height after the breakwater caused by different locations of diffraction wave or secondary wave height;Comparing the construction quantities and construction technology,we select the optimal elevation,which may serve as reference for the engineering design.