There are ordinary meals, soft rice food, semi-liquid food and liquid food, which should be supplied according to the patient’s specific condition and digestion and absorption ability respectively. For example, some patients after neck surgery are prone to choking and coughing when eating, which makes patients afraid to eat, so soft rice or soft and dry semi-liquid food should be given at this time. Patients with neck radiation therapy have less saliva, dry and painful throat, and difficulty in swallowing, so the diet should be more watery and cooler. 1.General diet General diet can be used for cancer patients without digestive system dysfunction. The common diet for cancer patients should be nutritious, light and delicious, easy to digest food, which contains more animal protein and vitamins, and not greasy, less fried food. Ordinary diet is suitable for: (1) cancer patients recovering from surgery; (2) patients before and after chemotherapy and radiotherapy; (3) patients with non-digestive tract tumors or various cancers without digestive system dysfunction; (4) patients without clinical acute stage symptoms such as fever and bleeding. General diet is the common diet for most early and middle stage cancer patients. Attention should be paid to the way of food preparation and reasonable matching, so that the food is fancy, nutritious and easy to digest, and attention should be paid to the patient’s taste and reaction. For patients before and after clinical treatment, a good general diet is one of the important measures to improve the nutritional status of the patient’s body, enhance the treatment effect and promote recovery. Soft diet is between ordinary diet and semi-liquid diet, which contains less food residue, is easy to chew and easy to digest, but cannot be cooked by deep-frying or frying. Soft diet is suitable for: (1) cancer patients with weak digestive function after radiotherapy and chemotherapy; (2) patients recovering from gastrointestinal tumor surgery; (3) oral diseases. The main food of soft diet should be buns, bread, buns, dumplings and other pasta, and more tender meat such as chicken breast and tenderloin should be used as dishes, fish, shrimp and liver puree can be consumed, and fluffy meatballs or meat cakes can be made from minced meat. Eggs can be cooked in various ways other than deep-frying. Vegetables should be chopped and cooked, should not eat mixed vegetables or vegetables with more coarse fiber, such as celery, bean sprouts, leeks, no strong seasonings such as chili and mustard. Eating fruits should be peeled, bananas, oranges, apples, pears, etc. can be eaten. Do not eat peanuts, almonds, walnuts and other dry nuts, but can eat peanut butter, sesame paste, almond cheese and other foods. 3, semi-liquid food generally based on liquid food, containing very little food residue, easier to digest than soft food. Since semi-liquid food contains more water, less food intake and lower nutrient supply, in order to meet the nutrient and caloric needs of cancer, most of them are eaten in the way of few meals (once every 2-3 hours, 6-8 times a day). Semi-liquid diet is suitable for: (1) many patients recovering from tumor surgery; (2) patients with serious digestive dysfunction; (3) patients with difficulty in swallowing due to oral and pharyngeal tumors; (4) patients with high fever. (4) Patients with high fever. 4. fluid food The food is mostly liquid, without food residue, and easy to digest. The liquid diet should be used for a short period of time because it can not meet the daily nutrient and calorie requirements. Liquid diet is suitable for: (1) esophageal cancer patients with middle or advanced esophageal obstruction; (2) oral and pharyngeal tumor patients with swallowing difficulties; (3) initial intake of food after various thoracic and abdominal tumors; (4) advanced cancer patients with extreme physical exhaustion. If the cancer patient has normal gastrointestinal function, but has difficulty in eating through the mouth, such as inability to chew, swallowing or loss of consciousness, nasal tube feeding can be used. For example, postoperative patients with tongue cancer, laryngeal cancer and jaw tumor, this method cannot be used temporarily for oral cavity. Nasal food is ideal for low-fat, non-fiber dairy, and can include polysaccharide protein, inorganic salts and various vitamins. The nasal diet is usually prepared by the hospital, and it should be a fine, fluid food with appropriate temperature, no residue, relatively complete nutrition and appropriate ratio. The total calorie intake of daily nasal feeding should be 1.2 to 1.5 times of the basal metabolism. (2) Elemental diet is a liquid nutrient that is nutritionally complete and composed of small molecules without dregs. Its main components are amino acids (or short peptides), monosaccharides, fatty acids, multivitamins (water-soluble and fat-soluble), minerals and trace elements, etc. The vast majority of the essential diet is digested, and the absorption readiness is up to 99.1%, and 100% of amino acids may be absorbed. It can be placed directly into the jejunum through silicone tubes via the nose and stomach. Since the nutrient solution is in a semi-digestible state, the body only needs 65-100 cm of small intestine to absorb and utilize it. It is a safe and economic nutritional support therapy. (3) Gastrointestinal nutrition support method This method uses intravenous infusion of all nutrients and calories required by cancer patients, including all essential and non-essential amino acids, essential fatty acids, vitamins, electrolytes and trace elements required by the body daily. The central intravenous infusion currently used in clinical practice can continuously and evenly infuse all the nutrients required by the body, and is not affected by the patient’s appetite and digestive function, so that the patient can maintain the body’s metabolism without eating, protect vital organs, reduce catabolism, and thus prolong the patient’s life. In recent years, some frail cancer patients have developed serious gastrointestinal nutritional disorders in the process of receiving radiotherapy and chemotherapy, and this method has been used to support the patients to improve their malnutrition significantly, so that they can tolerate radiotherapy, chemotherapy and major surgery. Currently this method is one of the clinical means to improve severe malnutrition in patients.