Abstract:This paper introduces the operation principle, structures and main characters of three - product dense medium cyclone, and the effect of its structural parameters on the results of coal separation, makes out the superiorities of the coal separation technology by way of 3NWX three - product dense medium cyclone with non - pressured feeding, at the last, points out that the further research should is to establish mathematical model for optimizing the structural parameters of three - product dense medium cyclone.