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Based on the construction project of 3 000 m3 trailing suction hopper dredger of the CCCC Shanghai Dredging Co., Ltd., combined with the development of the draghead of 4 500 m3 trailing suction hopper dredger in the project, the influence of the resistance along the drag arm jet water pipe system and the nozzle arrangement on the draghead jetting were studied. The flow velocity of the high -pressure jet pipeline and nozzle of the draghead of 4 500 m3 trailing suction hopper dredger was calculated by numerical simulation method, and the matching analysis of working points was carried out according to the performance curve of the high-pressure jet water pump. According to the flow field distribution of local flow surface near the nozzle, further optimize the shape of high-pressure flushing flow area and nozzle structure in the draghead, effectively reduce the pipeline resistance, reduce the energy loss in the process of high-pressure jet water transported to the nozzle along the drag arm pipeline, and significantly improve the nozzle jet water flow rate, and form the design scheme of draghead jet water pipe system and nozzle matching with the working point of high-pressure jet pump. [ABSTRACT FROM AUTHOR]