A woman with a breast volume of less than 200 ML and a flat chest is called micromastia. Breast augmentation is feasible for small breasts. The material chosen should be approved by the State Drug Administration, with three certificates of products. There are many methods of breast augmentation, and the most and the best methods used in clinic are silicone capsule implant breast augmentation and autologous fat particle injection filling technology. Silicone capsule breast augmentation: 1. Indications: congenital breast dysplasia; breast atrophy after breastfeeding or with mild ptosis; pectoralis major muscle retention after breast cancer resection, bilateral breast asymmetry. Cui Yongyan, Department of Plastic Surgery, Shenzhen Hospital, Peking University 2. Contraindications: local or systemic presence of infection foci; recurrence or metastasis of cancer foci is possible; too few breasts, too much demand and insufficient psychological preparation; history of keloid hyperplasia or those who have keloid physique. Body fat injection breast augmentation: 1. Indications: breast development is still good, local blood circulation is good, small breasts at a young age. 2. Contraindications: not suitable for small breasts with dried out, atrophic, sagging skin and older age. Breast Enlargement Reduction Surgery: The normal breast volume of Chinese women is about 250ml, more than this volume belongs to breast hypertrophy or macromastia. Mild hypertrophy, breast volume in 300-500ml, moderate hypertrophy 500-800ml, severe hypertrophy 800-1500ml. Huge breasts, greater than 1500ml, are also known as macromastia. Breast hypertrophy often has a family history, and its hypertrophy can be glandular hyperplasia-based or fat accumulation-based, both of which can be identified with the help of ultrasound or magnetic resonance. Indications: adult women with enlarged breasts or macromastia, in good health, with no special requirements for breastfeeding or not. Contraindications: poor physical condition, clear organic diseases such as coronary heart disease, diabetes mellitus, coagulation disorders, etc.; local or systemic infections; pregnancy or breastfeeding; tendency to scar proliferation. Breast ptosis correction: post-partum breast ptosis, age-related ptosis, etc. can be corrected through surgery to regain firm and beautiful breasts. Enlarged Areola Correction: Enlarged areola can be corrected surgically with incision at the edge of the areola margin, in the middle or at the root of the nipple. The choice depends on the specific situation and the width of the areola, and the principle is not to pull the nipple. Inverted nipple correction: It is suitable for those who have congenital inverted nipple, but cancer should be excluded. Nipple hypertrophy reduction: Normal nipple diameter 6-8mm, height 7-9mm, greater than this value is nipple hypertrophy. Enlarged nipples in women who have given birth or in men can be corrected surgically. Nipple or breast reconstruction: Nipple or breast loss caused by trauma, congenital disease or tumor surgery can be reconstructed.