Using two-dimensional shallow-water tidal wave motion equation and continuity equation, combining with measured data to verify the trend of points, we obtain the realistic flow field, and then analyze the impact from hydrodynamic force and sediment scouring and silting near the engineering site. The results show that the implementation of the project has little impact on the nearby sea flow field except the engineering-neighboring area, and the impact scope is northward 2 km centering the reclaimed area, 1.2 km westward, and 2 km southwest. The maximum scouring is 0.8 m and the largest deposition thickness is 3 m.