Sodium Diacetate(SDA) is a kind of new-type grain, beverage additive of food, used in the food additive extensively (for instance, toasts food, candy, fat, meat products, oil, soy sauce, dressing, pastry, fast food, soup custard and powder stock,etc.); Grain fodder and green-feed additive; The printing and dye industry is used as the acid pharmaceutical; Use as even to take pharmaceutical, buffer, rust inhibitor and reply and worthy of and defend mould main batching of pharmaceutical,etc.1) the antiseptic and antiseptic effect is better than that of benzoic acid, and the general dosage is 0.3-3g/kg. 2) do not change food characteristics, not affected by the influence of food itself PH, participate in the metabolism of human body, produce CO2 and H2O, can be considered as part of food, keep the original color, fragrance and nutrition of food. 3) It is widely used in mould proof and anti-corrosion for all kinds of foods, and is also widely used in medicine, tobacco, paper making, fruit preservation, feed and other industries. 4) easy to operate and can be directly added or sprayed or impregnated. 5) soft sourness, which overcomes the peculiar smell of propionate.