1, radiotherapy patients should pay attention to drink more water, more than 1600ml a day, in order to facilitate the excretion of toxins in the body. Drink water and soup 30-60 minutes before meals. 2.Patients with severe stomatitis, esophagitis and dysphagia caused by radiotherapy should pay attention to oral hygiene, gargle frequently with light salt water, and can make homogenized food for drinking. 3.If the normal diet is insufficient, oral supplementation of multivitamins and trace elements and enteral nutrition preparations can be considered. 4, should be based on the condition, nature of the disease and the individual characteristics of different patients to decide food taboos. 5, radiotherapy treatment, early after surgery and other acute phase of various diseases should not over-emphasis on nutrition, should not be supplemented. 6, dietary balance on the basis of appropriate increase in high protein and high vitamin food intake. 7, food should be light, soft, good digestion. Avoid coarse, hard, stimulating, greasy food. 8, poor appetite should take a small amount of the principle of multiple meals to increase the amount of food. Severe reaction can also take two meal system, that is, breakfast in advance, dinner delayed, breakfast at 6:00 a.m., 3-4 hours after gastric emptying and then chemotherapy, 7:00 p.m. chemotherapy after the end of the 2 hours into the evening meal, in the middle of the juice, tea, lemonade, you can drink some light tea, lemonade. 9, try to ensure that you eat something before you start chemotherapy, and take advantage of the treatment response occurs in the intervals and appetite to eat more. Most patients find that eating a light diet before chemotherapy will make them feel better and increase their tolerance of chemotherapy drugs. 10, not all patients have a reaction, the size of the reaction with the type of chemotherapy drugs used, the dose, nature, give way and individual differences. For patients with loss of appetite and dyspepsia, multivitamin preparations such as B vitamins, digestive enzymes and probiotic preparations can be supplemented. And use appetizing, digestive food, such as white radish, yam, yogurt and so on. 11, if nausea, vomiting, poor appetite and other reactions are more serious, you can ask the doctor to prescribe some symptomatic drugs, which will be very helpful to reduce the symptoms. If the side effects are too big, don’t be too hard on yourself, eat small meals and more nutritious and healthy nutritional food. 12, some gastrointestinal side effects may last a few days and disappear. If the side effects continue to cause a significant reduction in food intake for more than a week, you should contact your dietitian or doctor in a timely manner.