Numerical simulation study is carried out to increase jet scour productivity and reduce energy consumption in dredging engineering.Based on the sediment scouring model,a moving jet scouring model is established for a silt bed with a median particle size of 0.048 mm,and the reliability of the numerical simulation parameters are verified combined with the physical model test results.The model successfully simulates the phenomenon of vertical submerged jet scouring the sand bed,and analyzes the influence of moving speed on the jet scouring depth,productivity and specific energy.The results show that the scour depth and cross-sectional area of gully decrease with the increase of moving speed.There is a range of the most economical jet moving speeds,so that the scour production is maintained on a good basis with as little energy consumption as possible.The research results provide theoretical support for jet scour to increase production and reduce energy consumption.The range of the most economical jet velocity can be used to guide dredging engineering practice.