Purpose: Panax ginseng is traditional precious Chinese medicine. It has widely biological activity.This subject studies on the water-extract of Panax ginseng,American ginseng and Korean ginseng. Analyzed the chemical composition of water-extract and extracted main component; measured the contents and consists for total saponins and polysaccharides;Discussed compositions of saponin in water- extract and composition of monosaccharide in polysaccharides;Analyzed the antioxidant activity of the water-extract an...