Aiming at the problem of sediment deposition obstructing navigation in the initial stage of 175 m experimental impoundment,we make a comprehensive analysis of changes of channel conditions,causes of shoal navigation obstruction and dredging technology in the Three Gorges Reservoir area in the past ten years based on the measured hydrological and river terrain data,as well as the channel maintenance dredging scheme of the Three Gorges Reservoir area from 2010 to 2022.The results show that by properly increasing the water depth of the trench and combining dredging with blocking,it is beneficial to the transportation of pebbles,the stability of the channel and the remarkable dredging effect.From the perspective of dredging timing,the effective combination of the Three Gorges Reservoir scheduling and dredging beach risk characteristics,reasonable arrangement of construction timing,not only improve the construction efficiency,but also alleviate the contradiction between construction and navigation.