In response to the serious sedimentation in dredging projects of rivers,lakes,and reservoirs in China,as well as the high construction cost and low environmental protection performance of traditional cutter suction dredgers,the development of the “Junlan” large depth fully electric drive assembled cutter suction dredger is carried out.The overall layout,main dimensions,power configuration,connection devices,and intelligent control system of the ship are studied.Diesel and shore electric dual power drive are used,and the construction cost of pure shore electric drive is reduced by 66.7%,while reducing carbon emissions.The cutter,underwater pump,and cabin pump are driven by variable frequency motors,which intelligently control the speed of the mud pump and cutter to increase suction concentration and reduce construction costs.Equipped with independently developed high-efficiency mud pump and cutter system,the conveying efficiency is increased by more than 10%.The cutter is adopted a thin slice design,and the excavation efficiency is increased by more than 15%.The “Junlan” is successfully achieved the design and construction of a fully electric drive assembled cutter suction dredger with a depth of 25 m,and achieves significant effect in construction cost control,environmental protection performance,excavation efficiency,and suction efficiency.