First, the role of chemotherapy drugs chemotherapy drugs do not tightly kill malignant cells, normal cells are also harmed, and then induce remission during the period prone to infection, to ensure that the indoor air is fresh, regular air and ground disinfection declined visits to avoid cross-infection. Second, chemotherapy drug adverse reactions 1, skin local reactions: multiple injections or drug leakage can cause phlebitis or necrosis, protection of blood vessels. 2, bone marrow suppression: most chemotherapeutic drugs inhibit bone marrow mass nadir for 7-14 days, followed by 5-10 days of slow recovery. Gastrointestinal reactions: can cause nausea, vomiting, poor nausea and other reactions, so the diet should be light, tasty, a small number of meals. At the same time, we should strengthen the mouth rinse with mouthwash to keep the oral health. 3, liver and kidney function damage: the liver and kidney function should be regularly monitored. 4.Uric acid nephropathy: drink more water 2000-3000ml/day, pay attention to the urine volume and urine sediment examination results. Third, dietary principles common reaction in chemotherapy is leukopenia, at this time the patient’s resistance is reduced, prone to infection, should strengthen nutrition to improve the body’s resistance. 1, high protein food to choose poultry and eggs, lean meat, animal liver, kidneys, dairy, beans and their products are appropriate. High vitamin food should choose yeast hair pasta food, cereals, peanuts, green fresh vegetables, fruits, fruit juice, etc. to supplement vitamin C, B and folic acid, etc. 2, high protein food can be made into fluid or semi-liquid, easy to digest and absorb. But all kinds of food must have a certain amount of sugar, salt and water. Daily water needs 3,000 to 3,500 ml, it is recommended to drink a small amount of water several times. 3, sit up as much as possible to eat and drink: try to talk with others or do deep breathing when eating, and encourage family members to accompany. 4.Overcome fear: insist on eating even with nausea and vomiting. 5, hair loss hair loss is the partial or total loss of hair. Hair loss often occurs 2-3 weeks after the start of chemotherapy, and usually grows back 2-3 months after the end of chemotherapy, sometimes hair can also grow out during chemotherapy. During hair loss to protect the scalp, you can wear a hat or a headscarf when you go out. 6, constipation after chemotherapy constipation is due to slow bowel movement, causing dry stools and difficult to pass. You will feel intestinal peristaltic pain, flatulence, and nausea. There will also be hiccups, belching, stomach cramps pain, pressure in the rectum to hold the feeling. Drink plenty of water to soften the stool and drink warm water for better results. Drinking juices and eating more high fiber foods also help. Note; if constipated for 1-2 days, inform your doctor, who will give laxative or stool-softening medication.