Liposuction is the use of physical and chemical methods to dissolve or break the subcutaneous fat tissue, through the liposuction needle and negative pressure pipeline will be broken and dissolved fat suction. The hazards of liposuction for thinning calves are as follows: 1, bleeding, bruising: if the important blood vessels are damaged during the operation or the volume of one suction is too large without timely replenishment of lost body fluids, it can lead to serious complications; 2, skin unevenness: it is mainly related to uneven suction, inconsistent depth of the level and the degree of local skin laxity, and the level and volume of the suction should be mastered in surgery; 3, skin necrosis: the damage of the vascular network of the skin caused by the medical origin of the force is the cause of the local skin necrosis. Skin necrosis: the damage of subcutaneous vascular network caused by exogenous medical force is the main cause of local skin necrosis, but the general area of necrosis is not large; 4, sensory dullness: after liposuction, skin numbness can occur in all kinds of auxiliary liposuction, which is a direct damage of peripheral nerves by suction tube, and it can lead to sensory dullness in the postoperative period; 5, skin scar: it is mostly due to the damage of subcutaneous vascular network, and it is generally easier to be damaged in the parts that have been suctioned off; 6, subcutaneous hard nodules : after liposuction, some hard nodules can be touched or the whole suction area becomes hard, due to the damage of subcutaneous tissue, the formation of scar nodules or hematoma mechanization, fat liquefaction.