Liposuction of thighs is a common operation in cosmetic surgery, and the effect of liposuction is being improved with the continuous innovation of technology, but if an irregular and unqualified institution is chosen for the operation, the following hazards may occur: 1. Local unevenness: due to the immaturity of the operator’s technology or lack of awareness, etc., it may lead to uneven fat layers being extracted during the liposuction process, resulting in the connection between the extracted and unextracted parts 2.Infection: During the liposuction process, if the operator’s action is not standardized, the disinfection is not complete or the operation time is too long, it can lead to infection; 3.Bleeding: The operator’s rough action can damage the large blood vessels, or the postoperative pressure is not good, resulting in excessive subcutaneous bleeding, causing subcutaneous petechiae or bruises; 4.Fat embolism: Fat embolism is the most dangerous situation. Embolism is the most dangerous situation, because there may be vascular damage during liposuction, fat particles into the blood vessels, can cause important vascular damage, causing complications, and in serious cases, can lead to death. To sum up, when candidates undergo thigh liposuction, they should choose a regular hospital and a professional doctor to avoid unnecessary hazards. When the amount of liposuction exceeds 2000ml or more, it is a tertiary plastic surgery project with great technical difficulty, and should be performed in a tertiary plastic surgery hospital or a plastic surgery department of a tertiary general hospital, so as to guarantee the safety and effect of the surgery.