Various centrifugal compressors are used extensively in the industrial fields nowadays. The design requirements are more complicated to meet the needs. It is difficult to determine the optimal design point of a centrifugal compressor. The efficiency is a traditionally important factor for an optimization. In this study, the impeller weight of a compressor is also considered. The aim of this study is to present a design trend considering the stage efficiency and the weight of an impeller in certain cases. Kriging method is performed with sample points from 1D design program data. The optimal points are determined in a substitute design space.