Investigation shows that more than 50% of female tumors and 33% of male tumors are related to diet; unreasonable diet may cause tumor occurrence or aggravate development. Reasonable diet and nutrition are beneficial to the treatment and recovery of tumor, and diet plays an important role in improving the survival quality of tumor patients, and also plays a role in preventing tumor recurrence and metastasis. 1.Tumor patients should have adequate supply of caloric energy, but prevent excess and maintain standard weight. 2.Carbohydrate supply should account for about 65% of total caloric energy. 3.Protein supply should be sufficient, generally accounting for 12-14% of total caloric energy, of which animal protein and legume protein should account for 30-50% of total protein, and food options are fish, shrimp, eggs, milk, lean meat, rabbit, chicken, tofu and soy products with less oil. 4, fat supply accounts for 25-30% of the total caloric energy, should not be excessive; saturated fatty acids, monounsaturated fatty acids, polyunsaturated fatty acids ratio of 1:1:1 is appropriate. Patients with cardiovascular disease, P / S value of 1.5 to 2.0 is good. 5, the diet should be less frequent, regular and quantitative, recipes light, moderate warmth, easy to digest. 6.It is advisable to eat fresh vegetables and fruits rich in dietary fiber and vitamins, such as: tomatoes, potatoes, carrots, cauliflower, cucumbers, eggplants, bananas, etc. 7, under the guidance of doctors, often use the following foods: shiitake mushrooms, mushrooms, monkey mushrooms, enoki mushrooms, seaweed, nori, stone cauliflower, hairy vegetables, silver fungus, black fungus, Ulva, soybean sprouts, mung bean sprouts, string beans, garlic, cabbage, pumpkin, peas, coix seeds, lettuce, asparagus, yam, radish, carrot, spinach, tomatoes, water chestnuts, apples, dates, five fruits, tea leaves, sea cucumber, sea jelly, Sardines, mackerel, snapper, sea fish, milk, goat’s milk, etc. 8, be careful with greasy and fried food, such as: fatty meat, duck, fatty goose, butter, cream and shortening pastry, cream cake, butterscotch, doughnuts, etc. 9, be careful with foods containing high cholesterol: such as animal liver, heart, kidney and egg yolk, pine eggs, salted duck eggs and fish roe, crab yolk, etc. 10, avoid overeating, avoid smoking and alcohol.