Abstract: The separation of authigenic illite is a key point in the K-Ar dating of authigenic illite in sandstone reservoir.High speed and ultra-high speed centrifuges are used home and abroad.In this paper,a new method using microporous membrane and vacuum filtration is introduced,which is outstanding for easy operation,fast speed,high efficiency and good quality.The device structure,assemblage and operation instruction are illustrated firstly.And secondly,the characteristics or innovations in 5 aspects of the device and the technological procedure are described in details.Finally,the separating efficiency,quality,application situation and prospect of the device and the technique are discussed.Series of technological problems of the elder vacuum filtrating device,such as miscellaneous operation,low efficiency and poor practicality,have been overcome by the 5 innovations.The new device could be developed into formed equipment for daily use and for scientific research and experimentation,providing a new method for authigenic illite separation,and also have a broad potential applicability in the future.