The advantage of autologous fat transfer breast augmentation is that it has a natural appearance and feel, and because it is self-tissue, there is no rejection, so don’t worry about long-term complications, unlike prosthetic breast augmentation where there are long-term complications such as aging and rupture of the prosthesis, displacement of the prosthesis, and contracture of the envelope. However, breast augmentation with autologous fat grafting is technique-dependent, and the results depend mainly on the surgeon’s skill and experience (surgeon-dependent), requiring the surgeon to be particularly adept at liposuction and familiar with breast anatomy. The amount of fat to be injected in the breast and the level of injection must be well known. Injections should be evenly distributed, and where to inject and where to stop injections is purely based on experience. The decision on how to inject should be based on the anatomical shape, size and laxity of the skin of the breast, rather than being uniform. Although the main purpose of autologous fat augmentation is breast augmentation, the liposuction process is also critical, otherwise, although the breast is bigger, but the liposuction area is not aesthetically pleasing and unacceptable. For thin patients, liposuction is very challenging. It is very difficult to selectively extract fat from the thin subcutaneous fat without affecting the local appearance, so many doctors are reluctant to give thin patients autologous fat augmentation.