During the discussion of this project, the centrifugal pump design of clean, disposable water-suction, selecting and determining the basic parameters of the centrifugal pump, the hydraulic design of the centrifugal pump blades, the hydraulic design of the water cell in the centrifugal pressure, the suction cell, and perform the calculation and balance of radial force and power, and finally perform a strength test to prolong life and meet the technical requirements.The most design and difficulty property of the pump is the sealing of the pump. This design uses a new form of sealing packaging, which is characterized by a device that can change the sealing force according to the pressure change.