Based upon the characteristics of reversed micellar solutions, a cylindrical bowl centrifugal extractor Model HL-20 was tested for the extraction of protein. The hydraulic characteristics of this installation were investigated, and the optimal operation range was found. The interfacial radius in the rotating bowl was calculated, and the maximum throughput was determined from the dispersion number. The entrainment in the raffinate is lower than 5%, and the entrainment in the extract is about zero. The stage efficiency is above 95% under appropriate conditions. Al of these verified that the cylindrical bowl centrifugal extractor is applicable to protein extraction by reversed micellar solution.