Stachyose(Stachyose tetrahydrate) is a low molecular weight tetrasaccharide composed of galactose, glucose, and fructose. It is found in the rhizomes of plants in the genus Stachyose and is a functional oligosaccharide that exists in nature. Stachyose is a sugar formed by the combination of two α - galactoses with a 1,6-glycosidic bond on the glucose side of sucrose. Its molecular formula is C24H42O21, and the pure product is a white powder with a slight sweetness of 22% of sucrose. It has a refreshing taste and no odor. Soluble in water, insoluble in organic solvents such as ether and ethanol. Stachyose has good thermal stability and does not decompose at high temperatures of 100 ℃. However, its thermal stability decreases under acidic conditions, making it suitable for food that requires hot pressing treatment. The storage stability in acidic environments is related to temperature, and it is quite stable when the temperature is below 20 ℃. Both moisturizing and hygroscopic properties are lower than sucrose but higher than high fructose syrup, with an osmotic pressure close to sucrose. At temperatures above 80 ℃, stachyose has coloring properties and can be added to baked goods to give them an enticing burnt yellow color.