Oncology patients have high energy consumption, so they need to increase protein and calories by 20% more than normal people. If malnutrition has developed, more protein supplementation is needed. The best protein intake is vegetable protein and some animal protein. In addition, attention should be paid to choosing low-fat, low-salt and vitamin and inorganic salt-rich foods, which are beneficial to the treatment and recovery of tumor patients. To arrange the diet of tumor patients, besides considering the above nutritional factors, attention should also be paid to make full use of the anti-cancer substances in food. Certain foods can induce cancer while others can fight cancer. Tumor patients should try to avoid cancer-inducing foods and eat more cancer-fighting foods. According to research, common anti-cancer foods include cruciferous vegetables (such as cabbage and cauliflower, etc.), radish, garlic, sour plum, soybean, beef, mushroom, asparagus, coix seeds, etc. The diet of tumor patients should not only focus on its content, but also consider their hobbies and eating environment. Eating their favorite food can increase the secretion of gastric juice, which can promote appetite and improve the absorption and utilization of food. In addition, the eating environment can also affect the patient’s appetite, so a pleasant eating environment should be created for the patient. The diet of tumor patients includes common rice, soft rice, semi-liquid food and liquid food, which should be supplied according to the patient’s specific condition and digestion and absorption ability. For example, some patients with advanced lung cancer are prone to choking and coughing when they eat, so they dare not eat, so they should be given soft rice or soft and dry semi-liquid food. Facial radiotherapy patients have less saliva, dry and painful throat and difficulty in swallowing, so their diet should be more watery and cooler. Due to the different treatments received by tumor patients, appropriate diet should be given according to the specific treatment methods. For example, patients receiving radiotherapy and chemotherapy often have abnormal taste and anorexia, and everything they eat becomes bitter or tastes wrong. The way to deal with this is to eat more high-protein, high-nutrient food and fresh fruits and vegetables; add condiments to food, make more food with good color, flavor and shape to arouse appetite, drink a small glass of acidic beverage before meals can play an appetizing role, and give the patient the right amount of zinc and vitamin B complex, which can also improve the sense of taste and increase appetite.