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Cordyceps sinensis (Berk.) Sacc.(Cs),known as Dong-Chong-Xia-Cao (winter worm-summer grass) in Chinese,is a precious medical mushroom formed on an insert larva.Cordyceps sinensis has been used in China ancient times,mainly as a general topic to strengthen and improve lung and kidney functions,to restore health after prolonged sickness and to boost and maintain overall body health.Nowadays the bioactivity and medical value of Cordyceps sinensis has gained worldwide attention and attracted great research efforts.Polysaccharides are the most abundant and important biological active compounds from Cordyceps sinensis.