In view of the Shenzhen-Zhongshan channel west artificial island shape,the physical model test is used to verify the stability of armor block and overtopping rate of crest under the extreme waves.The results show that:the incident wave rapidly forms energy accumulation at the top of the concave island wall arc,and produces complex and unfavorable wave states such as wave energy release and vortex flow at the convex corner of the island end;the convex and concave islands weaken the engagement performance of ACCOPODE,which is influenced by many factors,resulting in the instability of the 5 t heavy design armor block,then by several times of optimization,the trunk section of the island wall is increased to 8 t,and the special section of the end corner needs to be increased to 14 t to be stable;the law of overtopping rate is that the section from the wave incidence to the end corner gradually increases.Comparing the test results with the calculation of the standard formula and the results of the 2D flume section test,it is found that the stability and overtopping rate under the influence of the island shaped are both large,especially in the special area where the end corner protrudes,so the designer should pay attention to it,and try to follow the relevant provisions of the standard,that is,the axis turns outward to ensure that the included angle is more than 150°.By this test,the necessity of 3D overall test in stability,overtopping rate and optimal design is verified again.