The external characteristic test of the centrifugal pump was carried out on the closed test bench of the centrifugal pump. At the same time, the low specific speed centrifugal pump was simulated by the full flow channel non-constant value. The simulated value and the experimental value were in good agreement, which verified the reliability of the numerical simulation. The cavitation test of the centrifugal pump was carried out at the design flow Q=8.6m3/h. The cavitation performance simulation curve and the experimental curve change trend basically, which verified the feasibility of the cavitation model.