A dredging project in Tianjin is implemented with a large cutter suction dredger，and the maximum discharge distance of the project is about 17 km.Since a single non-self-propelled large cutter suction dredger cannot meet the requirement of long discharge distance construction，the series connection construction technology of large cutter suction dredgers is studied.By removing the bridge frame，steel pile positioning，and other systems of idle cutter suction dredgers and adding auxiliary equipment such as anchor cable positioning，the adaptive transformation for the large cutter suction dredgers is carried out through series connection construction.Through the theoretical calculation of various working conditions of series connection construction，the optimal construction spacing range of two dredgers is determined.The productivity and stability of the series system of the large cutter suction dredgers are improved to ensure the completion of the project on schedule.The results show that the equipment reconstruction plan and series connection construction technology of large cutter suction dredgers can meet the project requirements of long discharge distance construction，reduce production costs and idle dredgers，and increase productivity by about 24%，with remarkable results.