The surface waves are simulated and extreme parameters are calculated in the Xinghua Bay in this paper. The typhoon process is simulated by the MM5 model. Then wave elements such as significant wave height, wave period and wave direction are simulated every 1 hour by SWAN model based on the double-grid nesting in the whole of Xinghua Bay. By comparison and validation, both the simulation wind data and wave data show a good agreement with the observation data. Extreme parameters of wind speed, wave height and wave period in 16 direction are calculated according to Pearson-Ⅲ distribution at the point of -40m isobaths in the Xinghua Bay. The results show that the strong wind is in direction SE and the wind speed of 50-year return period is 35.61m/s. The strong wave is in direction E and the significant wave height of 50-year return period is 10.04m. The relative mean wave period is 12.82s. Furthermore, the SWAN model is used to simulate the wave fields from deep water to the shallow water with different wave levels and different wave direction. The wave elements of different return periods are obtained inside and outside the submerged breakwater. The wave height before and after the breakwater is compared. The transmission coefficient and the significant wave height after overtopping is obtained.
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