According to the wave data of 11 wave observation stations in Dalian sea area and nearby, the basic wave features of dominated wave directions, the strongest wave directions and their frequencies on different coastline segments are studied, and wave rose diagrams of 11 stations are drawn. Based on relevant literatures, the out-sea deepwater design wave characteristics on different coastline segments are analyzed, and the 50-year frequency wave heights and wave periods are presented. The results shows that the strongest wave direction in Dalian sea area in Bohai sea is of near-north, and that in Huanghai sea is of near-south.