Regarding the problems such as poor construction adaptability of the large cutter suction dredgers developed in China under medium and long-term wave sea conditions，and limited row spacing in long row spacing projects. In this study，taking the “Tianshan” ship as a research object，through the theoretical analysis，numerical simulation，finite element analysis and calculation，real ship verification and other methods，we upgrade a series of the performance improvement，including the positioning system，the conveying system，and the power system.The technologies for large cutter suction dredgers，which has been successfully applied. It provides a reference for the performance improvement and transformation of the large cutter suction dredger developed at the early stage in China.