I. Indications for breast augmentation 1. congenital mammary gland dysplasia. 2, breast atrophy after breastfeeding or menopause. 3, Breast atrophy due to weight loss. Wu Kejin, Department of Breast Surgery, Obstetrics and Gynecology Hospital, Fudan University 4. Breast dysplasia or hypoplasia caused by lesions or trauma to the breast tissue before puberty. 5.Breast malformation or asymmetry with the overall shape. 6.Bilateral breast size asymmetry, accompanied by mild sagging or mild nipple depression 7.After simple mastectomy that preserves the nipple areola. 8, although the breast is not small, but also a strong demand for breast enlargement, and the breast meets the conditions of breast augmentation. Contraindications of breast augmentation 1.Inflammation in breast tissue and operation area, need to wait for infection control before surgery. 2, other parts of the foci of infection, need to control the infection after a month before surgery. 3.Autoimmune system diseases or rheumatic diseases. 4.Serious organic lesions in the heart, liver, kidney and other important organs. 5.People with scars should be carefully selected. 6.People with tendency of recurrence or metastasis after breast cancer surgery. Surgery should only be considered for those who have been in stable condition for more than 3 years after surgery. 7.Patients with mental illness or psychiatric tendency. 8.Breast masses whose nature is not yet clear.