Isomalto-oligosaccharide is a kind of starch sugar which is made from corn starch by enzymatic transformation, refining and concentration. This product can promote the significant proliferation of Bifidobacterium in human body to regulate intestinal flora. Its function of water-soluble dietary fiber can help to moisturize intestines and defecate. It also has the characteristics of low calorific value and anti-caries, which is widely used in functional oligosaccharide.