Diabetes is with a certain genetic predisposition of endocrine and metabolic diseases, if not timely treatment or control the bad will lead to serious complications of cardiovascular, eye, kidney, nerve system. Chitosan oligosaccharide as dietary fiber, can slow diabetes on glucose absorption, activation function of islet cells, promote the secretion of insulin; (pH increases every 0.1 insulin activity increased 30%), improve their hypoglycemic ability: regulating body fluid acid-base degree, promote the body cells to insulin sensitivity, thus preventing the onset of diabetes.