The food additives has many kinds with huge quantities, It has been reached more than 2,000 varieties currently, which is widely used in the food manufacturing industry, The synthetic or natural substance can improve food quality and color, smell and taste as well as the need for preservation, preservation and processing technology. Each country has stringent control on the use of food additives, consumers are also mere mention of the food additive, the experts reminded that consumers needs not too worry about the food additives , during food processing,if not used food additives,it will take more risks, because the deterioration will cause food poisoning disease. Preservative is a kind of food additives which can appropriate prevent food spoilage, kill the toxigenic microorganisms caused by Aspergillus element, it is beneficial to human health. Food additives have a kind named as nutritional supplements, it can greatly improve the nutritional value of food, which has significantly positive on preventing malnutrition and nutritional deficiencies, and promoting nutritional balance. Phthalide is one of the food additive which we carefully focused on development, our annual production capacity is over 300 tons. products are sold to the US market nearby five years, the quality has been widely recognized.