Whether cancer patients need to avoid eating is a concern for patients and their families. Through years of clinical research and observation of a large number of cases, the author believes that this issue should be different from person to person and from disease to disease. Complete abstinence from food will often aggravate the condition; too strict abstinence from food will not only make the patients unable to adapt, but also cause the recipes to be too narrow, affecting the intake of nutrients by the patients, which is not conducive to the recovery of the body. Diet of cancer patients should pay attention to the following points: 1. Protect the function of spleen and stomach: increase nutrition should consider the function of spleen and stomach of patients, over-starvation or over-fullness will damage the function of intestines and stomach, and it should be avoided to enter foods that are difficult to be digested. Those who have cold spleen and stomach, especially those with stomach cancer and intestinal cancer, should not eat too much cold food, such as watermelon and pear. 2. Pay attention to avoiding the continuing effect of tumor pathogenic factors: such as eating too much fat, which can lead to the development or recurrence of rectal cancer and breast cancer, it is advisable to choose nutritious and fresh food with lightness, reasonably match the animal and plant food, advocate nourishment and avoid spicy stimulation, such as drinking alcohol and smoking. 3, the rational application of things of taste and efficacy: such as turtle Yin cool blood, suitable for Yin deficiency and blood heat, but its nature of cool and greasy, difficult to digest, on the spleen deficiency and Yin deficiency is not suitable. Ginger, peppercorns, garlic is hot, eat less can pass the Yang stomach, using the spleen and stomach cold, but more food is born internal fire, heat and toxicity within the person should not. 4, according to different treatment methods to choose diet: cancer patients after surgery, mostly see the deficiency of qi and blood, spleen and stomach weakness, in addition to high protein, high vitamin food to supplement nutrition, must regulate the spleen and stomach, to help the source of qi and blood. Therefore, it is advisable to eat more carrots, tomatoes, yams, mountain hold, lentils, coix seed, citrus, etc., after the spleen and stomach healthy transportation, it is advisable to increase the role of qi and blood food, such as jujubes, cinnamon, black fungus, goji berries and so on. Radiation therapy patients, radiation has injured the fluid, resulting in fluid deficiency and blood heat, dry mouth and throat, it is advisable to eat more sweet and cold to produce fluid and cool blood products, such as pears, watermelon, loofah, green beans, fresh lotus root, water chestnuts, etc., avoid tobacco, alcohol, chili and so on. Chemotherapeutic drugs are easy to cause gastrointestinal reactions and bone marrow suppression, first of all, to regulate the spleen and stomach, increase appetite, eat more nutritious food, such as yam, carrots, chicken, fish, coix seed, it is also advisable to increase the food to replenish the qi and nourish the blood, such as azuki beans, jujube, milk, placenta, seaweed, sea cucumber, mushrooms, and so on. Eat less fatty meat, turtle and other nourishing and greasy products.