Objective：This study was designed to evaluate the efficacy of breast conserving operation plus radiotherapy. Methods： From January 1989 to march 1994, 63 cases with early breast cancer, among them, 22 cases were in StageⅠ , 41 cases in Stage Ⅱ were treated using breast conserving surgery plus radiotherapy. Tangential field irradiation was used with dose of 45 Gy－ 50 Gy. Tumor bed was irradiated additional 15 gray－ 20 gray with electron beam. Results： The 5 and 10 years survival rates were 92.1％ and 87.3％ respectively. In all of 63 patients, only 1 cases developed radiation induced pneumonitis. The cosmetic effects were satisfactory for all patients. Conclusion： In early stage of breast cancer, the effects of breast conserving operation plus radiotherapy were simitar to that of radical mastectomy. Thus for legible early stage breast cancer breast conserving therapy could be the first choice.