Due to the continuous decrease of sediments coming from upstream,the area of sediment blocking in the Yangtze estuary has generally entered the state of erosion,and the coastal wetland resources are losing obviously.At the same time,the amount of dredging maintenance in the Yangtze estuary deepwater channel has also been reduced,and the dredged soil resources are becoming increasingly valuable.In recent years,the maintenance volume of dredging has been basically stable at 55 million～60 million m3/a.The utilization of dredged soil in the channel to replenish the nearby eroded shoal can be an important direction for the utilization of dredged soil resources in the future.To foster the ecological intertidal zone,filling to the shoal without cofferdam is a process way requiring further research.Taking Hengsha shoal as an example,by referring to the viscoelastic model of the dynamic response of the silty seabed under the action of waves and the measured rheological characteristic parameters of the dredged soil in the outer channel of Lianyungang Port,the attenuation rate of the wave height of the silty seabed under different incoming wave heights and different floating mud densities was studied and analyzed,and the results of maximum wave dissipation effect when the floating mud density was 1.20～1.30 g/cm3 were obtained.The ideas and methods of this paper can provide references for the filling process without cofferdam of dredging sediment from the Yangtze estuary deep-water navigation channel.It is also suggested to carry out experimental research on the dynamic rheological properties of dredged sediment from the Yangtze estuary deep-water navigation channel.