Leaves of the green tea plant camellis sinensis contain up to 36 % polyphenols.Epigallocatechin gallate (EGCG) is the most interesting polyphenols because it exhibits a strong antioxidant effect.Furthermore, it has been demonstrated that EGCG has an antimutagenic and an anticancer effects, an antibacterial effect and a beneficial effect on cholesterol level in blood.Therefore, is needed to isolate EGCG in a pure form in high yield by simple and com. process.This method for isolation of EGCG contents the following steps: a) selection of macroporous polar resin for the preparative liquid chromatog.; b) selection of polar elution solvent; c) determination the temperature and pressure for adsorbtion and desorbtion of the polyphenols of the green tea.Therefore, it was searched the interconnection between yield of EGCG and the range of temperature and amount of eluent.Finally, the process for the separation of Epigallocatechin gallate from green tea extract was developed in the laboratory and EGCG was isolated with the concentration 92% by the yield 43%.Accordingly, the technol. of EGCG production based on the preparative liquid chromatog. was launched and introduced on the market.