Breast cancer is one of the malignant tumors that are sensitive to chemotherapy, and there are more cases of chemotherapy for 8 times. Generally, chemotherapy for breast cancer is divided into postoperative adjuvant chemotherapy, preoperative neoadjuvant chemotherapy and palliative chemotherapy for advanced breast cancer. The main purpose is to shrink the tumor and reduce the stage, so that the breast cancer which is not curable by surgery can become curable by surgery. If the adjuvant chemotherapy is given 8 times after surgery, it means that the tumor may not be excised cleanly or the primary lesion of the tumor is relatively large, so more times are done to prevent recurrence and metastasis. There are also some advanced tumor patients who have 8 times of chemotherapy, it is possible that the patient’s physical condition can tolerate chemotherapy, which is also a performance that can further prolong the survival.