In recent years, the incidence of breast cancer has increased significantly both at home and abroad, and the value of drug therapy is particularly important in the process of breast cancer treatment. Although there are many improvements in the current treatment of breast cancer, such as surgery, radiotherapy, chemotherapy, endocrine therapy and targeted drug therapy, there are still some clinical problems worthy of study. In order to obtain better results in clinical work, several common clinical aspects are discussed. The strategy of chemotherapy regimen selection: The principles of breast cancer drug therapy should track the international multicenter evidence-based medical findings as the basis for selecting or updating the treatment regimen. This includes the size of the constitutive dose of the drug, the time of administration, the density of the drug, the length of the course of treatment carambola and the comprehensive situation of the Porphyria pair, etc., to arrange the treatment regimen in a timely and reasonable manner. Because there is no monitorable index to evaluate the treatment effect of adjuvant treatment after breast cancer surgery, we can only select the treatment plan after careful and prudent analysis according to the conclusion of evidence-based medicine and the comprehensive situation of each patient, and strictly prevent over-treatment and under-treatment.