Sodium alginate dissolves in hot and cold water to form a viscous colloidal solution, which is a hydrophilic gelling agent with very strong hydration ability. Low calorific value, non-toxic, easy to swell, high flexibility, good thickening, stability, gelling, foam stability, anti-aging of products, and promoting cohesion. Adding it to all kinds of noodles can obviously increase the viscosity and anti-brittleness of the food, so that the product has strong gluten, good toughness, delicate taste, and has a gluten. Delicate, the dosage is 0.1%-0.5%; in bread and cakes, the expansion rate is increased, the products are soft and chemicalbook elastic, the dosage is 0.1%-1%; when used in dairy products and beverages, it can improve the taste of the product, Improves the curd shape of yogurt. The dosage is 0.25% to 2%; it is also used in candy, cold food and food fillings. It can improve the taste and has good gel properties. In addition, it is also a dietary fiber, which can reduce serum and liver in human body. Cholesterol can inhibit the rise of total cholesterol and fatty acid concentration, and can also prevent the absorption of harmful elements such as strontium, cadmium and other metal ions. Therefore, it is helpful for the treatment of hypertension, coronary heart disease and diabetes. In addition, it can also be used as textile pulp, cosmetic thickener and fruit preservative.