Due to the invisibility of underwater operations,the dredging construction of cutter suction dredgers not only affects the construction quality of the project,but also affects the accurate determination of production performance to a certain extent.Accurately grasping the production efficiency of cutter suction dredger rock excavation is an urgent problem that needs to be solved in current engineering construction.Taking the rock excavation test project of a cutter suction ship in the offshore section of the Western Land Sea New Channel (Pinglu) Canal estuary as an example,based on three-dimensional graphics software,a dredging model of the channel is constructed.The construction quality and excavation efficiency of rock excavation by cutter suction dredger are analyzed based on the statistical data of ship monitoring system.The results show that the analysis method combining three-dimensional models with monitoring system statistical data is more accurate in soil category discrimination and statistics,more precise in mining production efficiency calculation,and more intuitive in construction quality analysis.The research results can provide references for ship construction in the later stage of engineering.