A parameterization method of radial turbo machinery is presented in this paper,and corresponding computer code is developed.An optimization platform for a centrifugal impeller is constructed by integrating three modules of the optimization process,namely parameterization,mesh generation and numerical calculation.The commercial optimization software Isight and computational fluid dynamics software NUMECA are used in the present study.The Krain impeller is taken as an example to validate the optimization system,8 parameters that affect the shape of the mean camber line are selected as design variables,and isentropic efficiency and total pressure ratio are set as objective functions.After the optimization an impeller with better performance is obtained.The results demonstrate the feasibility of the parameterization method and the validity of the integrated optimization platform.