Lujiahe waterway is located in sandy-pebble section of middle of the Yangtze River,and it is seriously obstructed navigation for many years.At present,maintenance dredging technology is used as the main way to ensure the waterway unobstructed.Combining with the maintenance dredging technology of Taipingkou waterway in 2018,we analyze the characteristics of riverway and the causes of navigation obstruction,propose dredging idea,scheme and design parameter,and analyze the effect of dredging engineering by mathematical model.The results show that according to the complex navigation obstruction reasons of Taipingkou waterway,multiple factors should be taken into account in dredging ideas at present,such as upstream water level control with shallow water depth improvement,steep slope and rapid flow problem improvement with channel width improvement,dredging in advance to reduce maintenance pressure of low water level,layered operation with consideration of construction and navigation.Dredging areas include shallow pack at the front of Sanning Chemical Terminal and rubble piles on the right edge of Maojiahuawu.After the implementation of the project,the navigable depth in dry season can be guaranteed.Influence on water level upstream channel is little.Velocity near the dredging area can be reduced.It can provide a wider slow-flow area for ships