1, pay attention to the dietary balance Dietary balance is the basis for maintaining the balance of the body. Common food is the best source of nutrients for the organism. For patients with different clinical conditions such as malnutrition, it is recommended that individualized nutritional treatment should be carried out by a professional clinical dietitian after assessing the overall condition of the patient. 2.Food diversification and rationalization To ensure the intake of balanced and comprehensive nutrition, daily food diversification is necessary, that is, according to the proportion of the five major food groups shown in the Chinese population’s balanced diet pagoda. 3, small number of meals, eat light and easy to digest food For patients after radiotherapy and surgery due to weakened digestive function, increasing the number of meals can achieve the purpose of reducing the burden on the digestive tract, while increasing food intake. 4, should not be too taboo taboos should be decided according to the disease and the individual characteristics of different patients, do not advocate too much taboos. Most patients need to restrict or taboo food: high temperature fried, smoked barbecue, spicy and stimulating, greasy and raw food. The saying of “hairy food, only alkaline food, etc.” lacks scientific basis and should not be listened to or believed. Avoidance of food should be decided according to the nature of the disease and the individual characteristics of different patients. During chemotherapy treatment, various patients in the early post-operative period should not over-emphasize nutrition and large supplements during the acute phase, and then supplement after the digestive function has basically returned to normal. We should pay attention to long-term slow tonic, choose seasonal tonic, and take tonic according to the individual.