The incidence of breast cancer in China is increasing year by year, which is a serious threat to women’s health, and chemotherapy is an important part of comprehensive treatment for breast cancer patients. The nutrition during chemotherapy and interval period also affects the quality of survival and treatment effect of patients. At present, there are many misconceptions about the diet of patients and their families. Scientific and reasonable dietary guidance can enable patients to survive various reactions well, avoid complications and improve the therapeutic effect. Chemotherapy period due to the toxic effects of drugs, the first impact is the gastrointestinal tract, performance of varying degrees of nausea, vomiting, loss of appetite, abdominal distension, etc., although there are a variety of antiemetic drugs, but there are still patients will have different reactions, patients and family members worried about drug toxicity damage to the organism, try every possible means to supplement through food, to high protein, high calorie, high nutrition food such as fish, eggs, meat, shrimp, eels, turtle, etc.. If the family insists on asking the patient to eat these foods, it can only be counterproductive, aggravate the above symptoms and sometimes even cause conditioned reflexes, and the organism will still have an aversion to these foods during the recovery period, unwilling to eat and see. Drink more water, more than 1000~1500ml per day to promote renal excretion and reduce drug toxicity. Clinically, some patients do not eat because they are afraid of vomiting, which is not scientific. Nausea and vomiting is a reflex activity controlled by the delayed brain, which can be caused by both the vomiting center and the stimulation of the emesis chemoreceptor area, and the vomiting caused by chemotherapy is due to the stimulation of the vomiting center, even if you do not eat, you will vomit. Therefore, it is not right to take no food, it can not reduce the symptoms, on the contrary, because there is no food in the stomach, repeated nausea and vomiting will lead to esophagitis, gastritis, and even aggravate the side effects. Therefore, patients should be encouraged to eat to ensure the intake of the three major nutrients, trace elements and multivitamins, it is advisable to eat a small number of meals, eat light, easily digestible food, such as rice soup, porridge, rotten noodles, vegetable soup, etc. The amount of each meal should not be too much, and the variety of patterns to increase the patient’s choice, and at the same time can be used to nourish the Yin, cool and antipyretic food such as pear, sugar cane, watermelon, lotus root, etc. During chemotherapy, due to the use of antiemetic agents and patients in bed for a long time during infusion, constipation and abdominal distension caused by the slowing of intestinal peristalsis, etc. In order to relieve constipation, the patient’s diet should be taught according to the disease, not uniform, and patients should be instructed to eat foods containing fiber. Once constipation occurs, patients can be given to eat fiber-containing foods such as leeks, celery and other vegetables to promote intestinal peristalsis and relieve constipation; if the patient is severely constipated, swelling and filling foods such as honey, bananas and sesame oil should be the main guide to diarrhea. A week after the end of chemotherapy, the patient’s digestive tract reaction gradually reduced, appetite gradually restored, at this time can be given to the patient to increase food tonic. Generally, different diets can be given according to the patient’s condition and adverse reactions, such as: if the white blood cell count decreases, weakness and fatigue, eel bone soup, astragalus, codonopsis, peanut rice, etc. can be given orally. If the anemia is obvious and the hematocrit is decreasing, you can give red beans, red dates, blood glutinous rice, pig liver, etc., but the patient should not be forced to take the meal as the patient is willing to accept it, and should add or subtract appropriately according to the individual. At the same time, patients can be instructed to eat dried scallops, fungus, mushrooms, mushrooms, kelp and foods rich in vitamin C and carotene, which can play a role in suppressing cancer and enhancing immunity. In addition, if the patient is willing to take Chinese medicine, he can be instructed to take Chinese herbal medicine and proprietary Chinese medicine, which can play a role in regulating and supporting the righteousness.