Objective To explore the interaction of postmastectomy radiotherapy （PMRT） and breast reconstruction， and elucidate how to choose the type and timing of breast reconstruction. Method Literatures about PMRT and breast reconstruction were reviewed. Results PMRT might increase the incidence of complications and impair the cosmetic satisfaction of breast reconstruction. Breast reconstruction might also compromise the effect of PMRT. Conclusions In patients who will receive or have already received PMRT， the optimal approach is delayed autologous tissue reconstruction after PMRT. If PMRT appears likely but may not be required at the time of mastectomy，delayed-immediate reconstruction may be considered， or immediate autologous tissue reconstruction may be considered in case of patients awareness of the increased complications and impaired cosmetic outcomes from PMRT.