The working mechanism of centrifugal pump is based on centrifuge force. The liquid enters the pump center and impeller’s blades. Then electromotor will rotate impeller in high speed because of the reduction of the pressure in this place, the liquid existing in the impellers blades will also rotates and its kinetic energy increases and liquid flows outward by the centrifuge force and fill the pump chamber, finally the kinetic energy of liquid changes into the pressure potential energy.