Aiming at the unreasonable power reserve setting of the cutter suction dredger equipped with the 900 mud pump and the fact that the dredger is not suitable for long-distance discharge projects，this paper determines the appropriate increase in mud pump speed and improves the lift of the cabin pump by 16.5% and that of the underwater mud pump by 17% through the CFD simulation analysis method，thereby improving the long-distance discharge performance of the dredger. After the speed of the pump body，shaft system，pump cover connecting bolts，and auxiliary sealing water pump increases，the paper analyzes their adaptability to ensure that the pump can meet the requirements of the dredger’s long-distance discharge in terms of hydraulic power，structure，and auxiliary equipment，and it can provide a reference for similar cutter suction dredgers to improve their long-distance discharge.