Breast dysplasia is mostly caused by congenital disorders, while a few are caused by acquired factors, such as adolescent breast binding, chest burn scar contracture, etc. The main reason is the lack of glandular tissue, but the skin is still intact and elastic (except for those with burns). If it occurs unilaterally, it is often associated with pectoralis major muscle dysplasia or orthopedia. Bilateral cases may be due to insensitivity of the breast tissue to sex hormones during maturation. Breast dysplasia is mostly repaired by augmentation mammaplasty, with the main procedures being breast augmentation with prosthesis, breast augmentation with autologous fat injection and breast augmentation with autologous fat combined with prosthesis, also called compound breast augmentation. Breast augmentation with implants is still the mainstream method, the essence of which is to provide good tissue coverage for the implant. In implant augmentation, if the amount of tissue covered is thin, the edge of the implant will not be able to make a natural transition, and then autologous fat can be injected locally to modify the tissue depression deformity. On the one hand, the prosthesis provides the volume needed for breast augmentation and avoids complications such as fat caking, calcification and necrosis caused by applying large doses of fat injection; on the other hand, it makes up for the defects of convex edges and unnatural shape due to the placement of prosthesis. For people with thin body shape and lack of subcutaneous fat, autologous fat filler is not a suitable choice.