Aiming at the maximum bearing pressure of the high pressure water tank at the trailing suction hopper dredge is 2.2 MPa，and the high-pressure flushing pressure of the drag head is 38 MPa,it is necessary to design the water intake scheme of the header drag again,so as to provide a mechanism for studying the efficient scour of mud and sand by the high pressure water flushing drag head.Using k-ε in the turbulence model,the mixed grid is used to describe the high pressure flushing state,and three numerical models with different intake modes are established.Results show that the three schemes meet the effect of equable flow at the nozzle outlet,and the average velocity of the three sections is approximately the same.However,the flow field in scheme two of the scheme is quite different,and the velocity of each outlet section of the header is symmetrical along the center of the header.The inflow velocity of the elbow in scheme three varies greatly,which can easily cause damage to the elbow.