The study of pharmacology and technology of extracting tea-polyphenols, caffeine, tea-polysaccharide and tea-flavins partly from tea-leaf was simply summarized. There are four kinds of methods for tea polyphenols's single extration: solvent, sedimental extraction, resin adsorption and supercritical fluid extraction. The main methods of extracting caffeine are solvent, sublimation, adsorption and supercritical fluid extraction. On the basis of membrane isolation and resin adsorption, a new comprehensive tech...