The metabolic rate and the total amount consumed by tumor patients increase significantly, and the digestion and absorption utilization of nutrients decrease, which affects the normal metabolism of glucose, protein and fat, and patients should be encouraged to eat. Patients will have gastrointestinal reactions after radiotherapy and chemotherapy. (1) According to the patient’s preference, eat stimulating foods such as sour, spicy, salty, sweet and other flavors, and also eat ginger and garlic. (2) To avoid nausea, give dishes with less oil or no oil. (3) To prevent the occurrence of constipation can eat more fiber-rich foods such as cabbage, cabbage, leek, celery, banana, etc. to promote intestinal peristalsis. (4) In case of stomatitis and gastritis, give soft or semi-liquid food that is easy to chew, easy to digest and free from stimulation, eat more animal liver and egg yolk, and take VitB2 and VitC if necessary. (5) When white blood cells and platelets are reduced due to bone marrow suppression, apply blood-raising drugs and give blood-raising diets (Radix et Rhizoma Ginseng, Astragali, Radix Angelicae Sinensis, Radix Rehmanniae, Peanut, Red Date, Chickpea, Quail Egg) to assist in treatment.