Surgery is an effective treatment for ductal dilatation of the breast, and different surgical methods are adopted according to different stages of development.1. Mastectomy, which is suitable for the early stage of ductal dilatation, generalized dilatation of the ducts under the areola and subareolar lump with nipple overflow, is performed by making a curved incision along the edges of the areola, preserving the nipple, and removing all the dilatated ducts from the nipple downwards.2. Excision of mammary gland segments It is suitable for those who have subareolar lump with periductal inflammation, the large ducts belonging to this area and the surrounding tissues of the lump will be removed from the nipple to prevent the formation of subareolar cysts, breast fistula and nipple overflow in the postoperative period.3. Simple mastectomy is suitable for those who have extensive lesions of dilated ducts of the breast, large lumps, especially those who have adherence to the skin and form sinus tracts under the areola, the total subcutaneous mastectomy can be carried out. Subcutaneous total mastectomy or simple mastectomy can be performed.