Sandy soil productivity calculations require more complex delivery process,which involves the characteristics of pumps,piping layout information,driving power,natural soil density,settling velocity of flow,and often difficult to accurately obtain some amount.Based on the transportation principle of slurry pipeline,we analyze the restrictions of hydraulic dredger medium sand dredging productivity,and obtain the specific relationship between the particle size and productivity of hydraulic dredgers transportation under the system’s limitations of load and discharge pressure.According to the quantitative relationship,in cases of some sandy soil particle known,the productivity of other sand particle size can be obtained directly without needing complex calculations.This method can provide a reference for the forecast of the dredging project’s production and revision of the dredging norm.