Immediate breast reconstruction (stage I breast reconstruction), delayed breast reconstruction (stage II breast reconstruction) and immediate delayed breast reconstruction can be classified according to timing. Immediate breast reconstruction refers to the reconstruction and repair of the breast at the same time as the mastectomy. It has the following advantages that cannot be overlooked: 1. The removal and reconstruction are done in one visit, reducing hospitalization time and costs; 2. It does not delay adjuvant radiation therapy or chemotherapy, nor does it increase local recurrence. Immediate breast reconstruction is indicated for stage I, II and III patients, except for those with existing distant metastases, or those with contraindications to surgery. Delayed breast reconstruction can be performed at any time after mastectomy. In some patients, delayed breast reconstruction may be considered after adjuvant therapy has been completed and the patient has stabilized. If the postoperative treatment plan cannot be determined preoperatively or intraoperatively, especially if radiation therapy is required, in this case a skin expander can be inserted in the operative area and replaced with a breast implant or autologous tissue when the plan is clear or radiation therapy is completed. The advantage is that the local tissue of the breast is preserved as much as possible without forming a dead cavity that would affect the wound healing, and without delaying the adjuvant treatment such as radiation.