Indications This method is only suitable for small breast deformities that are flat or mildly sagging; it is particularly effective for breasts with some breast tissue. It is not suitable for small breasts with dryness, atrophy, loose skin and sagging breasts. Surgical Technique Use the middle of the inframammary fold or the anterior axillary line as the injection point, local infiltration anesthesia, pinch the breast with the left hand, insert the needle into the gap between the pectoralis major muscle surface behind the mammary gland and release the breast. The right hand slowly injects the fat particles into the posterior mammary gland with even force, adjusting the direction continuously during the injection process to disperse the fat particles. After the injection, massage the breast gently with both hands until the hard knot disappears after injection. Precautions 1, because fat injection breast augmentation has a relatively high absorption rate (50%), generally need to be injected several times to have a more obvious effect, before the operation should be explained to the patient, the absorption rate after the first injection is the highest, with the increase in the number of injections, the absorption rate gradually decreases. 2, the use of syringe liposuction method to avoid the use of negative pressure liposuction method, in order to reduce the damage to fat cells 3, the fat suction should not be placed for more than 1 hour to prevent fat cell inactivation 4, the amount of each injection should not be too much, a maximum of 150ml per side, otherwise the liquefaction absorption rate will increase, and inflammatory reactions such as redness, swelling, heat and pain will occur. 5, the level of injection must be chosen in the posterior gap of the breast or subcutaneous, if it enters the breast tissue, hard knots will easily appear. Inject evenly to maximize the contact area with the recipient area and increase the survival rate of fat. 6. Aseptic operation techniques must be strictly observed to prevent infection and to avoid increasing the absorption rate after transplantation. Post-operative complications and treatment 1.Infection 3 days after injection, there will be mild swelling and pain in the breast, which is a normal phenomenon, if the pain is severe or the pain is not relieved after 3 days, and the local redness and swelling are obvious, anti-infection treatment should be carried out and closely observed. In severe cases, incision and drainage should be performed. The main preventive measures are strict aseptic operation during surgery. 2.Breast nodules are fatty particles gathered into lumps, which may form fibrous nodules or cystic-like changes or caseous necrosis. It should be distinguished from breast tumor and can be differentiated by infrared scanner. The main preventive measure is to disperse the injection and massage fully after the injection to make the nodules disperse.