The special sugar is mainly composed of Fructo-oligosaccharides, xylo-oligosaccharides, isomaltose-oligosaccharides, galacto-oligosaccharides, L-arabinose, which are difficult to be digested and absorbed in the small intestine. It can proliferate beneficial bacteria, inhibit harmful bacteria, thus promote the balance and normalization of intestinal flora, improve intestinal function, and so on. It can also increase the volume of defecation and improve constipation., promote mineral and vitamin absorption, improve blood lipid metabolism, enhance the immunologic function, reduce the incidence of intestinal cancer and other effects etc. Therefore, it has an important role in human health.