Abstract: Inducers are a kind of special axial pump,which are applied widely in space transportation system as well as energy filed.Inducer hydraulic performance is impacted sensitively by flow field cavitation.Turbopump external characteristic parameter is relevant closely to inducer cavitation development extend,as inducer cavitation is the main source for turbopump head decline.In this paper,inducer cavitation generation as well as development discipline was revealed by both numerical and visualization experiment method.The relationship between cavitation models in microcosmic perspective and turbopump external characteristic curve in macroscopic perspective was revealed as well.Numerical calculation method as well as visualization experiment facility was introduced in detail.Numerical results agree well with experiment results,which indicate numerical method for inducer cavitation in this situation is appropriate.