Frequent occurrence of food quality and safety proves that it is not effective to solve the Problem only from mechanism and supervision mechanism. Instead, it may expand solution ideas from external environment inducing changes of social institutions. Edible agricultural products are raw materials of foods, so their quality and safety are decisive for food quality and safety. Combining with concept of quality and safety of edible agricultural products, from social economy, science, technology and culture, environment cognition, this paper made a further understanding of food quality and safety. It found that the quality and safety of domestic edible agricultural products are not completely resulted from human factor, and not completely quality and safety problem in practical sense. Design of problem solutions should consider such external factors as economic level and consumption concept, dual character of science and technology, cultural quality of the masses, and moral trait of the masses, and enhance matching of building of regulation tools with external environment.