Water-soluble green tea polysaccharides were separated and purified by Ultrafiltration membranes with pore diameter of 150 kD, 20 kD, 6 kD in turn. All the three fractions were further separated and purified by DEAE-cellulose ion-exchange chromatography and Sephacryl S-300 column chromatography, and more than 20 green tea polysaccharide components totally were obtained. Their purity and molecular weight distribution were determined with high performance gel permeation chromatography (HPGPC) equipped with EL...