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Different from traditional lifting design method and circular arc design method，streamline design method was employed to design high specific speed model axial-flow pump. The design method included linear amendment of exit circular and increased incidence angle from hub to tip of impeller. Ranges of incidence angle are from 0° to 3°，and the incidence angle becomes lower with higher specific speed. CFD technique was applied to simulate whole flow fields of model pump. Numerical results optimized the selection rules of hydraulic design parameters，and decreased more work on models made and models experiments. Then a series of model axial-flow pumps developed. These models have higher efficiency and broader high efficiency zones from the experimental results of countrywide model pump experiments in the same testing stand organized by Ministry of Water Resources in Tianjin city.