Fifty food additive factories approved to produce food additives by health department of Liaoning province were inspected for insurance of food additive safety. The health authority instructed the factories with productive condition not up to the national standard to do well in a limited time. The inspection results showed that 5 factories (10%) passed ISO9000, 43 factories basically met the requirement,3 factories did not meet the requirement, 4 factories had stopped production.Sixty-seven samples from 5 factories were tested.98% of them were up to the national food additive standard. The aspects that did not meet the requirement mainly were workshop, technological process, sanitary equipments, raw materials and final product storeroom, sanitary regulation, production beyond the approved range, environment both inside and outside the production site and the product labeling. After inspection, all factories that did not meet the requirement corrected their mistakes.98% leading cadres of the factories were trained in food hygiene knowledge.