Aiming at the calculation problem of the design wave elements of an artificial island in Panjin，the MIKE21 large-scale wave mathematical model is used to simulate the wave field in the nearby sea area before the project is implemented under the current topography，and the seepage wave elements in the return period and design wave elements of the water area near the project are calculated. The results show that：1）When the offshore waves propagate to the engineering area，the engineering position is mainly affected by the SW and SSW direction waves.2）The wave height changes relatively large within the -10 m isobath，and the wave height attenuates about 50% when it propagates to the engineering area . 3）The east and west sides of the project area are shoal areas. The waves are broken and the wave height attenuates significantly. 4）The waves mainly enter the front of the engineering revetment along the deep groove，and the SSW wave height is slightly larger than the SW wave height.