Inducer belongs to the impeller of axial flow pump, which has the cavitation characteristics of axial flow impeller. If there is no centrifugal force to promote the separation of bubble and liquid, the generated bubble will flow along with the liquid, and it is not easy to cause the blockage of the whole flow channel. The performance curve of the inducer can work under a certain degree of cavitation condition. In addition, some measures can be taken to improve the cavitation resistance of the inducer. Generally, the inducer is designed as an axial-flow impeller with light load. The larger the density of Jishan, the smaller the angle of impact, the larger the area of inlet flow, and the variation rule of the maximum thickness of the blade far away from the inlet are selected. So that the pressure of the flow around the inducer is uniform and the lowest pressure appears far away from the inlet. The inducer with high anti cavitation performance sacrifices energy index to some extent, so the efficiency of inducer itself is low.