Inulin is a plant reserve polysaccharide found in more than 36,000 plants, such as Jerusalem artichoke, chicory tuber, dahlia root, thistle root. Among them, jerusalem artichoke has the highest inulin content. Inulin has strong moisture absorption ability, which can combine with free water and reduce water activity. This can be fully utilized in food processing to delay the evaporation of water, prevent the product from becoming stale, and extend the shelf life and shelf life of food. It is an ideal functional food ingredient. It is also a good raw material for the production of oligosaccharides, poly fructose, high fructose syrup, crystalline fructose and other products. At the same time, inulin can also regulate blood fat, reduce blood sugar, promote mineral absorption, regulate intestinal microbial flora, improve intestinal health, prevent constipation, inhibit the formation of toxic fermentation products, protect the liver, prevent colon cancer.