According to the influence of the main scale of the sand barrier embankment on the wave elements (wave height，period，etc.) in the harbor area，the numerical simulation method of the MIKE21 is used to study the stability of the harbor under the cover of the gradient submerged levee，and design wave elements for each calculation point under wave conditions of different return period are obtained.The results show that when the wave direction is close to the course of the channel，the wave is greatly affected by the channel refraction，and the wave height is significantly reduced in the channel，while the wave height is increased on both sides.When the angle between the wave direction and the channel is about 20°，the water depth difference between the channel and the slope increases，and the wave energy refracted to the slope of the channel is enhanced.When the angle between the wave and the channel is about 42°，the influence of the channel on the wave energy propagation is not obvious.The design of the high water level is 2 years.Under the action of waves，the conditions of port stability in the port are relatively poor，and the current plan cannot meet the requirements of the specification.