Dredged soil in deep-water channels of the Yangtze Estuary is all dumped into marine dumping areas after 2020，which leads to waste of dredged soil resources. This paper uses a three-dimensional mathematical model of tidal current and sediment （SHIWM-3D） and numerically simulates the scheme of comprehensive utilization of dredged soil to the Hengsha shoal for sand stabilization and beach protection. In addition，the paper comprehensively analyzes the fluid flow distribution，sediment transport and diffusion，sediment deposition effect of dredged soil，and its influence on sediment deposition in deep channels. The results show that：1） Some sediments are deposited directly after the dredged soil is blown onto the beach，while others are diffused and transported with tidal currents. 2） Scour and siltation states appear in the Hengsha shoal during spring and neap tides，respectively，and the dredged soil is generally deposited in the shoal. 3） The deposition of the deep channels is slightly affected when the dredged soil in channels is blown onto the Hengsha shoal. 4） It is feasible to apply dredged soil in Yangtze Estuary channels to Hengsha shoal，which provides a direction for sustainable and comprehensive utilization of dredged soil in Yangtze Estuary channels after 2020.