EGCG is a biologic active substance extracted from green tea, and has large exploitation foreground of natural product. The high Purification catechins was enriched at least 5 times by A and B reagents to obtain and taken off caffeine and pigments, whose total content was determined to be above 95% by HPLC. The catechins complex obtained by the above methods was separated and purified by Sephadex LH-20 Column Chromatography to obtain EGCG monomer, whose Purification was over 96%,yield and recycling rate wer...