Objective To explore the indication,operative methods,operation skill and prevention of complications of mammotome(MMT) in breast diseases.Methods From Aug.2009 to Aug.2013,3676 breast lesions in 1356 patients received MMT micro-invasive operation by decussation process with different incision and needle tracks according to the location of lesions.Experience of the indication,operation technique and prevention of complications were summed up.Results 775 lesions were in left breast and 639 in right breast.652 patients had single lesion and 865 patients had multiple lesions.The pathology results:320 cysts (8.71％,320/3676) were adenosis of breast with mammary duct ectasia or with metaplasia apocrine.36 solid and cystic tumors (0.98％,36/3676)were intraductal papillomas.3310 solid tumors (90.04％)included 13 breast cancers (0.39％,13/3310),2246 fibroadenomas(67.85％,2246/3310) and 1051 adenosis(31.75％,1051/3310).10nodules of calcification were adenosis of breast.13 patients with breast cancer received modified radical mastectomy.The postoperative results:skin bruises in 184 cases(5％),hematoma in 36 cases(0.98％).No postoperative residual was found.Conclusion According to the strict application of MMT minimally invasive surgery and by decussation process based on the appropriate incision and needle track,MMT minimally invasive surgery can achieve safe,minimally invasive,good-looking and completely removal effect.