Abstract: The wind energy resources in Jiangsu Sea area are evaluated based on the ERA5 surface wind data from the European Center for Medium-Range Weather Forecasts（ECMWF）considering the temporal and spatial distribution,stability and resource reserves of wind power density. The results show that the annual average of wind speed and wind power density in the south area is generally higher than the north and increase with the distance from the shore. The wind power density level of Lianyungang Nearshore Area is less than level 2,and level 3 and above are mainly distributed in offshore waters;while most areas in Yancheng and Nantong reach level 2 or level 3,and can be rapidly raised to level 4 or above about 30 km offshore,except for the coastal intertidal beach area. Wind power density shows obvious seasonal variation except in the coastal areas. The wind energy stability in the waters near Nantong and the south of Yancheng is the best,and relatively poor in the coastal area of Lianyungang. The effective reserves of wind energy resources in Nantong and southern Yancheng are the highest,followed by northern Yancheng,and the lowest in Lianyungang.