Daijiazhou river reach is one of the famous shallow risks in the middle reach of the Yangtze River waterway，and its waterway locates in the right branch.After the early regulation，channel conditions improve gradually，but the channel dimensions are still difficult to achieve the planned standard.Based on the characteristics of riverbed evolution and navigation-obstruction，this paper establishes a two-dimensional mathematical model of water and sediment，calculates and analyzes the riverbed evolution trend，researches systematically the second phase scheme of waterway regulation project，and proposes the recommended scheme.Numerical simulation results show that the implementation of the regulation scheme will effectively increase the current velocity of the shallow area on the direct channel，which is conductive to scour after the flood，and thus improves the navigation condition of the shallow area.