As a tumor patient, the following principles should be followed in terms of diet and nutrition: 1. Avoid eating foods that can trigger the pathogenesis of tumor, such as over-eating fatty, sweet and thick taste, moldy foods, unfresh vegetables or foods containing nitrosamines (such as sauerkraut, pickles, etc.). 2. According to Chinese medicine, the source of nutrients is the digestion and absorption function of spleen and stomach. Any treatment (radiotherapy, Chinese medicine) should avoid damaging spleen and stomach. Stabilizing emotion also has a positive effect on improving diet and nutrition of patients, most tumor patients have worries and pessimism. Most of the tumor patients have worries and pessimistic emotions. “Thinking hurts the spleen” leads to mental discomfort and obvious loss of appetite. 3, food has sex (cold, hot, warm and cool), taste (sour, sweet, hard and salty), and patients have different types of evidence due to different conditions, the disease also has the properties of cold, hot, warm and cool, so the diet should be selected according to the patient’s condition, such as hot patients can not eat warm tonic products such as ginseng, mutton, dog meat, etc. to help the heat, but should eat root, asparagus, etc. to clear heat. Patients with cold or cold constitution should eat less cool food such as pear, duck and goose. In case of stomach cancer patients, they should avoid smoked foods, stimulating seasonings such as chili, raw garlic, etc. 4. Diet should also be combined with supporting the righteousness and eliminating the evil, and diet is also important as an auxiliary role of supporting the righteousness and eliminating the evil. Many cereals, animals, fruits, vegetables and other foods in the diet have positive effects. If the spleen and stomach are still functioning well, choose some foods with anti-tumor effects, such as raw coix seeds, bitter gourd, yellow cauliflower, walnuts, seaweed, shiitake mushrooms, etc. This will combine food nutrition with food treatment. Therefore, tumor patients do not need to deliberately pursue “taboos”, as long as they maintain normal eating habits and structure and ensure balanced nutrition, it is enough to meet the nutrients required by the body.