Abstract: In order to study the parameters of hydraulic-gathering technology in tuber of Nymphaea, the influences of experimental parameters of hydraulic-gathering effect of Nymphaea were investigated according to the wash principle of high pressure water jet. The L9(34) orhogonal table of the hydraulic-gathering of Nymphaea was designed to cover process parameters such as water jet pressure, jet flow, speed, angle of jet scouring. The results showed that the four parameters significantly affected the hydraulic-gathering efficiency, the jet flow and jet pressure were the main factors for the hydraulic-gathering effect. The optimum parameter technology was as follow: 0.2 MPa of the water jet pressure、15 mm of nozzle diameter、0.71 m/min of speed and 0 of angle of jet scouring. The hydraulic-gathering efficiency was increased with the increasing of the jet pressure and jet flow. The increasing of the jet pressure consumed more power than that of the jet flow. So the higher water jet pressure was token priority at the condition of constant power.