To avoid harming the water environment of the dredging area，we adopt the heavy-duty cutter suction dredger to excavate the deepwater channel rock without blasting the reef.For the excavation of deep channel rock with heavy-duty cutter suction dredger，we carry out initial planning，and renovate the dredger and optimize the construction technology and structure during implementation，calculate the productivity of different hardness of rock excavation，consumption，consumption and tooth wear data for the transportation of the dredged soil through the pipe line，and summarize the law of rock excavation of deepwater channel with cutter suction dredger，serving as reference for the similar engineering.