Chemotherapy kills cancer cells and normal tissue cells at the same time, which leads to the occurrence of chemotherapy side effects. Clinical countermeasures for chemotherapy side effects are divided into the following aspects: 1. When gastrointestinal adverse reaction occurs, patients should be instructed to pay attention to easy digestion, high protein and high fiber diet, and at the same time, strengthen the treatment of antiemetic and antidiarrheal therapy, and strengthen the treatment of nutritional support through intravenous fluid infusion if necessary. 2. If there are myelosuppressive adverse reactions, in addition to treatment with drugs to raise white blood cells, platelets and improve anemia treatment, if necessary, also need to give broad-spectrum antibiotics to prevent infection or blood transfusion treatment. 3, for patients with liver function damage, treatment can be added to drugs to protect the liver, renal impairment can be applied to drugs to protect the kidneys, and at the same time, try to avoid giving drugs to damage the liver and kidney function. For phlebitis, external ointment can be applied for treatment, such as the external application of polysulfonic acid mucopolysaccharide, and the incidence of phlebitis has been gradually reduced with the popularization of PICC and Port placement technology.