Abstract: Based on the non equilibrium suspended load and bed load transport equations and the sediment transport capacity formula derived by Dou Guoren, a 2 D numerical model of total sediment transport in the Yangtze River estuary is established. In the model, the actions of tidal currents, wind waves and the effect of salinity on sediment transport are considered. It applies an automatically generated boundary fitted grid with orthogonal curvilinear coordinates. The verification of calculation shows the sediment concentration, the deformation of seabed and the silt in channel caused by tropical storm can be successfully simulated.