Chemotherapy is a very common form of anti-tumor treatment, and chemotherapy is certainly useful in order to prevent tumors from metastasizing to distant sites chemotherapy. It is divided into intravenous chemotherapy and oral chemotherapy, and there are also cases where intravenous chemotherapy is combined with oral chemotherapy. Chemotherapy may bring about gastrointestinal reactions, most commonly nausea, vomiting, and so on. In addition, it may cause a decrease in white blood cells, anemia, lower hemoglobin and other bone marrow suppression reactions. Therefore, chemotherapy should be accompanied by adjuvant drugs, mainly antiemetic treatment, white blood cell elevation, and blood supplementation. Chemotherapy is divided into courses, post-operative adjuvant chemotherapy usually takes 4-6 courses, if it is palliative chemotherapy for advanced tumors, it may take more courses, such as 10-20 times. It depends on the patient’s body tolerance status, and there is no need to force chemotherapy if it is not tolerated.