By using depth-averaged two-dimensional hydrodynamic model to simulate water depth and velocity distribution under different flow rates around L-shape and orthogonal shape ecological spur dikes, and drawing characteristic of its flow field,the impact range was acquired on setting spur dikes aroundSchizothorax Prenantispawning ground.Based onSchizothorax Prenantisuitability curves, WUA value can be got from repairing river.Research results showed that L-shape and orthogonal shape ecological spur dikes,the ratio of its body length to river width kept between 0.25 and 0.33 and the ratio of its head length to the length stayed between 0.20 and 0.25,staggered in the river,which can create a suitable flow pattern and satisfy the hydraulic characteristics ofSchizothorax Prenantispawning and increase WUA value. After the rehabilitation measures were carried out,the hydraulic condition similarity was high.
