Chemotherapy for breast cancer patients is divided into adjuvant chemotherapy, neoadjuvant chemotherapy and palliative chemotherapy, etc. The number of times of these chemotherapy means can be up to six times, so six times of chemotherapy is normal. Breast cancer is a common malignant tumor in women, and the occurrence of the disease is related to many factors, such as heredity, gene mutation and so on. Chemotherapy for breast cancer is mainly divided into the following categories: Adjuvant therapy: for early stage patients, several courses of chemotherapy are given after surgery, which can prevent tumor recurrence and metastasis; Neoadjuvant chemotherapy: for patients with relatively large tumor load or lymph node metastasis, chemotherapy is first used to shrink the tumor and control lymph node metastasis, and then surgery is carried out, which has better efficacy and can reduce postoperative recurrence; Palliative chemotherapy: chemotherapy is the main treatment for advanced patients. Breast cancer is very sensitive to chemotherapy, and many advanced breast cancer patients can prolong their survival through chemotherapy. Chemotherapy is a traditional systemic therapy, which makes the chemotherapy drugs reach the lesions with the blood to achieve the purpose of killing tumor cells. It is important to note that the drugs should be applied under the guidance of a doctor and should not be taken by oneself.