Diet and health care are closely related to the recovery of diseases, especially for chronic diseases and tumor patients, they should scientifically arrange the dietary knowledge suitable for their conditions. In general, tumor patients should master a basic nutritional principle: 1, pay attention to dietary balance: Dietary balance is the basis for maintaining the immunity of the body, and common food is the best nutrient for the body. 2. Food diversification and rationalization: To ensure the intake of balanced and comprehensive nutrition, daily food diversification is necessary, i.e., according to the proportion of the five major food groups shown in the Chinese population’s balanced diet pagoda. 3.Small and multiple meals, light and easily digestible food: For patients after radiotherapy and surgery, due to the weakened digestive function, increasing the number of meals can achieve the purpose of reducing the burden on the digestive tract and increasing food intake at the same time. 4, should not be taboo: taboo should be decided according to the disease nature and the individual characteristics of different patients, do not advocate too much taboo. General patients need to restrict or taboo food are: high temperature fried, smoked barbecue, spicy and stimulating, greasy and hard food, etc.. Steamed, boiled and stewed foods are suitable. 5.Choose foods with anti-cancer effects: fruits and vegetables (such as asparagus, carrots, spinach, tomatoes, broccoli, potatoes, kiwi, citrus), soybeans and their products, edible mushrooms, nuts, seaweed, barley, milk, eggs, etc.