Research and practice on maintenance and dredging engineering are conducted to address the navigation obstacles faced by the Xiaziliang shoal section of the Three Gorges Reservoir’s variable backwater area during dry season,such as bends,narrowness,rapidity,and danger.It is found that the overall trend of this beach section is slow and continuous sedimentation by collecting a large amount of historical measured data and comparing and analyzing the changes in isobaths and erosion and sedimentation over the years.On the basis of the waterway conditions and water characteristics of this river section,the construction equipment and the water level are compared,and a reasonable maintenance and dredging plan is formulated.Implementation results of the project indicate that the maintenance and dredging project can improve the conditions of the waterway,expand navigable waters,and reduce the difficulty of ship operation,thereby ensuring the smoothness and safety of the waterway.