Abstract: This paper presents the principles of the selection and preparation of oxygen enrichment membrance (OEM) and the recent progress of membrane materials in terms of the physichemical morphology and separation mechanism of the membrane, it also reviews the types of membrane modules, the scales of the equipment, the commercial applications and economic returns of the OEM, Finally, it alalyzes the state of arts of OEM research in China and points our major areas for future OEM research.