This paper studies the wave distribution of Jiangsu sea with SWAN wave model,which was driven by the wind filed from 1991 to 2011.Firstly,the tidal level is simulated by Delft 3D flow model.Then,the wave parameters of Jiangsu sea are computed.Lastly,the wave condition of Jiangsu sea area is analyzed.The result shows that:the annual average wave height becomes smaller from southeast to northwest.The largest annually average wave height is around 1.5 m.Most waves come from direction NE and SE,and the strong wave direction is NE.The wave height in winter is larger than that in other seasons.