Abstract: According to in-situ measurement data of the 12.5 m deepwater navigation channel(DNC) of the Yangtze River estuary, the backsilting intensity is highly dependent on the variation of tide types. It means that from the neap tide to the spring tide, the hydrodynamic condition becomes stronger, and the sedimentation in the channel decreases respectively; and from the spring tide to the neap tide, the sedimentation is increasing with the tide energy reduction. But the current dredging management only takes account of the influence of freshwater inflow, so the relation of dredging and backsilting intensity is very poor. According to the intensity of dredging, and the correlation between backsilting intensity and tidal hydrodynamics, in the future, the study of the impacts of the tidal dynamic process combined with the dredging arrangement for the north deepwater navigation channel of the Yangtze River estuary upon the backsilting intensity can be carried out, and the relationships between “dredging versus backsilting” and “freshwater inflow versus tidal forcing” and their influences on macro and micro erosion-deposition environments can be explored, so as to find out a reasonable dredging power allocation management principle, to maximize the dredging efficiency, and to provide a new thinking space for the optimal allocation of the deepwater channel dredging resources and waterway sedimentation reduction.