Abstract: Objective : To explor the clinical characteristics and treatment for breast carcinosarcoma. Methods : Clinical data of 10 patients with breast carcinosarcoma were analysed retrospectively, including the course of surrouding operation and the outcome of follow-up. Results : All cases were diagnosed by pathological test after surgery. The follow-up time was 5 to13 years. Survival period was 3 years and 4 months to 13 years. The 5-year survival rate was 80.0%(8/10). Conclusions : The breast Carcinosarcoma is a rare malignant turmor which lacks unique clinical features, and definitive diagnosis is often difficult. Patients were treated with mastectomy, postoperative chemotherapy and radiotherapy,the prognosis was better than that of general breast cancer.