The performance of dredging equipment exerts a decisive impact on the regulation effect of suspended rivers.To investigate the performance of the high-pressure flushing system for typical suspended river dredging equipment,a numerical simulation method is adopted to study the flow field inside the pipelines and nozzles of the system.The results show that the structural layout of the original high-pressure flushing pipeline and nozzles is unreasonable.The difference between the maximum and minimum outlet velocities of all nozzles is 3.86 m/s,and the relative deviation of the outlet velocity of No.9 nozzle reaches 17.35%.The outlet velocity distribution of each nozzle is extremely non-uniform.In view of the above findings,a targeted structural optimization scheme for the towed harrow high-pressure flushing system is proposed and verified by numerical simulation.After optimization,the outlet velocity of each nozzle becomes highly uniform.The velocity difference between the maximum and minimum outlet velocities is only 0.33 m/s,and the relative deviation of the outlet velocity for all nozzles is within 1.10%.The overall flow field of the towed harrow high-pressure flushing system is significantly improved.The research results can provide a reference for the design of dredging equipment used in suspended river regulation.