It is the fat tissue that is retained and its location that determines the final shape of the body, not the fat tissue that is aspirated. The goal of liposuction is not to remove the maximum amount of subcutaneous fat, but to create a better shape that will satisfy the patient. Patients with liposuction have often suffered from obesity for a long time and therefore have a strong desire to have as much fat removed as possible, and excessive aspiration often results in uneven skin after surgery, which is extremely difficult to correct; in sexually sensitive areas such as the lower abdomen and inner thighs, excessive aspiration can result in decreased type sensitivity. In addition, maintaining the right amount of fatty tissue in the abdomen of young women is a prerequisite for pregnancy. The post-surgical results of fat aspiration are mainly determined by the quantity, quality and distribution of the preserved tissue, such as the integrity of the vascular nerve plexus and skin support bands. Only if the complete subcutaneous vascular plexus, skin retraction system (elastic fibers, subcutaneous tissue fibrous septum, etc.) and a certain thickness of skin fat layer are preserved can an aesthetic result be achieved. Blind over-aspiration can damage the above-mentioned tissues and lead to complications. Once fat tissue is removed, it cannot be regenerated; therefore, the defects caused by excessive aspiration are permanent and extremely difficult to correct. Fat aspiration should not be done at the patient’s request and over-aspirated. The surgeon should decide on the amount of fat to be aspirated based on pre-surgical expectations and intra-operative judgment, preserving the appropriate layer of skin fat for optimal medically derived skin retraction. It is important to note that at the end of surgery, the skin fat layer is thicker than normal due to tissue edema, residual partial swelling fluid, and the shape may still appear bloated. Three months after the surgery, the tissue edema subsides, the residual swelling fluid and broken fat cell components are absorbed, and the skin retraction reaches its maximum, at which time the shape state is the final result. Therefore, the surgeon should always judge the residual fat thickness during the surgery and know when to stop aspiration, which is the key to avoid post-surgical complications. If any depressions are found due to excessive aspiration, autologous fat particles should be injected in time to fill the depressions. Immediate autologous fat particle injection grafting has a high survival rate and can effectively correct the deformity. If, at the time of surgery, it is not detected in time, once the old depression is formed, it can only be corrected by autologous fat grafting; if extensive depressions are formed, it is very difficult to correct them.