Based on the in-depth analysis of the bed evolution characteristics of Douhudi channel,we establish the 3D current numerical simulation model.According to the regulation objective and regulation thought,we carry out 3D movable fixed-bed study on the regulation effect for the river reach,including mainly the calculation of the speed and pattern for local current,and analysis and study on the flow strength and plane distribution of the shearing stress,and obtain the variation situation of scouring strength within the engineering protection scope.The research result may serve as reference for the revetment engineering design and optimization.