According to the inquiry of Fenghuang. com, compound polysaccharide is a kind of saccharide compound made up of various polysaccharide molecules, and it is an invention patent applied by Infinitus (China) Co., Ltd. The anti-influenza effect of compound polysaccharide composition extracted from traditional Chinese herbal medicines was officially granted a patent certificate issued by the European Patent Office. Compound polysaccharide has higher biological activity and better stability. The compound polysaccharide shows remarkable effect in enhancing immunity.