Abstract:Tea Saponin is a pure surfactants which is mainly existed in tea seeds. Tea Saponin has many excel－ lent surface activities，such as emulsification，decentralization etc.It also have many biological activities，such as bacteriostasic activity ， anti - inflammatory effect and so on. It is widely used in chemical industry，pesticide， feedstuff，medicine and other important fields.The article has introduced the extraction methods from Oil-teacake and the purification methods from crude product of tea saponin.The purpose of the article was to give some construtive references for comprehensive utilization of Oil-tea-cake.