Pullulan polysaccharide has been widely used in medicine, food, light industry and chemical industry. pullulan polysaccharide is one of the four new food additives, which can be used as coating agent and thickener in candy, chocolate coating, film, compound flavoring and fruit and vegetable juice drinks. The aqueous solution of pullulan polysaccharide has a smooth, refreshing feeling and the characteristics of improving the taste, so it can be used as a food quality improver Chemicalbook and a thickener. Adding a small amount of pullulan polysaccharide in food processing can significantly improve food quality. For example, fish cake can improve taste and quality; Adding a small amount of pullulan polysaccharide to tofu can keep the flavor of soybean and simplify the process; Soy sauce. A small amount of pullulan polysaccharide added to condiments, pickles, sugar boiled fish and shrimp, and delicious food can stabilize its viscosity, increase its viscosity, and make its taste smoother.