1, the nutritional components of diet can fully meet the needs of students' physical growth and development, regulate various physiological activities and promote health; 2. Food must be fresh and harmless to human body; 3. The transportation, storage, collocation and processing of food meet the hygiene requirements, so that the food is easy to digest and absorb, and the nutritional loss is less; 4, diversified diet, good sensory characteristics and a certain sense of fullness; 5. Have a reasonable dining system and dining environment; 6. Have good eating hygiene habits.