Aiming at the flow field in the high-pressure flushing nozzle of the drag head on trailing suction hopper dredgers，this paper conducted the numerical simulation of the submerged jet of the nozzle by CFD technology.The jet pressures under different nozzle diameters，exit jet velocities，target distances，and jet angles are analyzed.When the other parameters remain unchanged，the pressure on the mud surface increases with the rise in the jet velocity，slightly increases with the enlargement of nozzle diameter，and decreases with the increase in target distance.When the jet angles are 90°，60°，and 45°，the pressure on the mud surface is the largest under 90° at the same jet velocity，while 60° is the best jet angle in terms of soil breaking amount.