Upsizing of cutter suction dredger can significantly boost its production capacity,and improve its dredging efficiency,and protect the environment and reduce the labor intensity.Very large cutter suction dredger is one of mainstream development direction.This study presents a rounded new design method of slurry transportation system on the very large cutter suction dredger(VLCSD),and introduces the application in the VLCSD designed by Shanghai Jiaotong University,which has the biggest power station(2.4 MW)and the biggest production capacity(target operating condition:delivery distance 8 km,dredging depth 30 m,discharge height 10 m,average particle size d50=0.23 mm,production capacity bigger than 8 000 m3/h)all over the world.This method is based on the researches of the predecessors about energy consumption in the slurry transportation by pipeline,the effect of slurry on the performance of centrifugal pump and so on.Optimizing operation point to enhance the economic performance of dredger and the limit conditions for checking design optimization method is proposed at first time.The results show that the efficiency of the pump is up to 84% and the efficiency of the diesel engine is up to 90% under the design condition,which can achieve a good energy saving and economic efficiency.