Grasping the law of sediment movement in Guanhe estuary sea area is the basis for studying of waterway regulation.Taking the sediment collected on site as the research object,we study the suspension law of sediment in Guanhe estuary under different water depths,wave periods and wave heights by large wave flume test,and research the sediment settlement characteristics under different initial concentrations and water depths by static water settlement test.The results show that the sediment concentration in the upper part of the water body is small and vary little along the vertical line under the limiting wave height,but the sediment concentration near the bottom is large.Overall,the sediment concentration near the bottom is 0.25 kg/m3 to 0.96 kg/m3 higher than that in the upper water.The range of sediment settling velocity is 0.08 cm/s to 0.20 cm/s under different water depths and initial sediment concentrations,which is the same order of magnitude as that of single sediment.The flocculation of sediment is weak in Guanhe estuary sea area.