In recent years, the multi-stage centrifugal compressors for chemical plants have been required to be more compact and to be highly efficient. Mitsubishi Heavy Industries, Ltd. (MHI) have been developing up-to-date stage (including impeller) configurations with a high flow coefficient, high revolution speed (high mach number) and high efficiency for Mitsubishi Centrifugal Compressor (MAC). This paper describes this development process.