Aiming at the problems that Longzhaowan，in the middle reaches of the Jialing River，is affected by the sand mining，the sand pits are all over the place，the local water drop is obvious，the radius of the middle-low water is only 350 m，the water flow is trapped and bent seriously，and the current channel scale cannot meet the requirements of the channel grade after canalization，we study the navigation characteristics，regulation parameters and regulation scheme of typical bend rapids，use the methods of field investigation，hydrologic statistics，empirical formula and numerical simulation，obtain a better regulation scheme to improve the navigation conditions of Longzhaowan Beach and reach the channel grade after channelization. The results show that the combination of damming and dredging for this kind of shoal hazards can adjust the riverbed shape and control the river bottom dredging，also achieve the regulation effect of increasing the water depth of the channel，improving the navigation flow pattern，and ensuring navigation safety.