The chemotherapy regimen for stage I breast cancer is generally postoperative adjuvant chemotherapy regimen, and the commonly used regimens include TAC regimen, TC regimen, AC regimen, EC regimen and FAC regimen. TAC regimen: docetaxel, doxorubicin, cyclophosphamide. 21 days as 1 cycle, total 6 cycles. TC regimen: docetaxel, cyclophosphamide. 1 cycle of 21 days, total 4 cycles. AC regimen: doxorubicin, cyclophosphamide. 1 cycle in 21 days, 4 cycles. EC regimen: epirubicin, cyclophosphamide. 1 cycle in 21 days, 8 cycles. FAC regimen: fluorouracil, doxorubicin, cyclophosphamide. 1 cycle in 21 days, total 6 cycles. Patients with stage I breast cancer do not necessarily need postoperative chemotherapy, it depends on whether there are indications, it is recommended to consult the doctor. Meanwhile, they should keep good mental state and actively cooperate with doctors. Targeted chemotherapy program should be chosen by professional doctors according to the condition.