2. Oligosaccharide is a new functional sugar source instead of sucrose, and it is a new generation of functional food facing 2 1 century. Inulin is another form of plant energy storage besides starch, an ideal functional food ingredient, and a good raw material for producing fructooligosaccharides, polyfructose, high fructose syrup, crystalline fructose and other products. L- arabinose can inhibit body fat accumulation, so it can be used to prevent and treat obesity, hypertension, hyperlipidemia and other diseases.