Xylo-oligosaccharide is a new type of oligosaccharide products in the world. In recent years, the United States and Japan have called functional food the food of the 21st century. In China, the development of nutrition and health food has formed a certain scale and shows a rapid development trend. Xylo-oligosaccharides can not only be widely used in health food, beverage, dairy products, confectionery, beverage and other foods, but also can be used as raw materials in food, chemical, pharmaceutical and feed industries. It is a hot research field in food, biological and chemical industries at home and abroad.Xylo-oligosaccharide, as a new feed additive, is a green product and is expected to be a substitute for antibiotics.