Food (food) planting, breeding, processing, packaging, storage, transportation, sales, consumption and other activities meet the national mandatory standards and requirements, and there are no hidden dangers that may damage or threaten human health, lead to the death of consumers or endanger consumers and their descendants. Food safety includes both production safety and operation safety; Including result safety and process safety; It includes both present security and future security. Food safety includes two aspects: the safety of food quantity and the safety of food substances. The prominence of the latter meaning and the weakening of the former meaning now reflect that while basically solving the food quantity safety in China, the safety of food substances has attracted more and more attention from the whole society. First of all, food safety is a comprehensive concept. As a concept, food safety includes food hygiene, food quality, food nutrition and other related aspects and food (food) planting, breeding, processing, packaging, storage, transportation, sales and consumption. As subordinate concepts, food hygiene, food quality, food nutrition, etc. (usually understood as the concept of department or industry) cannot cover all the above contents and all the links. Food hygiene, food quality and food nutrition overlap in connotation and extension, which leads to repeated food safety supervision. Secondly, food safety is a social concept. Different from the concepts of hygiene, nutrition and quality, food safety is a concept of social governance. The outstanding problems and governance requirements of food safety are different in different countries and different periods. In developed countries, food safety mainly focuses on the problems brought about by the development of science and technology, such as the impact of genetically modified food on human health; In developing countries, food safety focuses on the problems brought about by the immature market economy, such as the illegal production and management of fake, shoddy, toxic and harmful foods. China's food safety problems include all of the above. Third, food safety is a political concept. Whether in developed or developing countries, food safety is the most basic responsibility and commitment that enterprises and governments must make to society. Food safety is closely related to the right to subsistence, which is unique and compulsory, and usually belongs to the category of government guarantee or government coercion. The quality of food is often related to the right to development, which is hierarchical and selective and usually belongs to the category of business choice or government advocacy. In recent years, the international community has gradually replaced the concepts of food hygiene and food quality with the concept of food safety, further highlighting the political responsibility of food safety. Fourth, food safety is a legal concept. Since 1980s, some countries and relevant international organizations have gradually replaced health, quality and nutrition legislation with comprehensive food safety legislation from the perspective of social system engineering construction. 1990, the United Kingdom promulgated the Food Safety Law, in 2000, the European Union issued a guiding white paper on food safety, and in 2003, Japan formulated the Basic Law on Food Safety. Some developing countries have also enacted food safety laws. The comprehensive food safety law gradually replaces the basic food hygiene law, food quality law and food nutrition law, which embodies the requirements of the times. Fifth, food safety is an economic concept. In economics, "food safety" means having enough income to buy safe food. Dr. Yu He from China Agricultural University made a survey on rural consumption environment. He pointed out that now, the vast rural areas have become the hardest hit areas of problem food. Fake and shoddy food has a high frequency, a fast circulation speed and a wide range, and the means and forms of making and selling fake goods by unscrupulous businessmen are more sophisticated and concealed. Rural consumers' self-protection awareness is not strong, and their rights protection ability is weak. Moreover, with the acceleration of China's urbanization process, this phenomenon has been extended to the urban-rural fringe of some cities and the laid-off workers in cities. It is not difficult to see that food safety includes both production safety and operation safety; It includes both result safety and process safety (although food hygiene also includes these two contents, it pays more attention to process safety); It includes both present security and future security.