Abstract: To automatically generate the 3D model of axial-flow pumps, a parametric modeling method based on AutoCAD and VB was proposed. Based on the COM interface of AutoCAD, the impeller of an axial-flow pump was modeled by connecting the hydraulic model database throughADO and by usingVB as programming language. The 3Dflowfield in an axial-flowpumpwas simulated usingthe meanNavier-Stokes equations, the standardk-εturbulence model and the SIMPLEC algorithm, and from the simulated result, its hydraulic performances were predicted. The results show that the numerical simulation can predict the performances of axial-flow pumps so as to provide a reference for hydraulic design.