In response to the problem of large errors in traditional cutter positioning methods,a high-precision cutter positioning method is studied taking the channel slope construction of a dredging project abroad as an example.The high requirements for slopes in foreign dredging projects have made it difficult for the traditional cutter positioning method to continue,resulting in a significant decrease in construction efficiency and an increase in labor and material costs.By using the methods of the error analysis of the cutter plane system and the verification of ship plane positioning,error analysis and verification of cutter excavation depth system,and cutter envelope digging correction,through theoretical calculations and effectiveness verification,a high-precision cutter positioning method for a cutter suction dredger based on channel slope excavation is summarized,which greatly improves the accuracy and quality of slope construction.The results can accelerate the implementation and popularization of automatic dredging systems,providing reference for high-precision construction of similar cutter suction dredgers.