It is one of the signs of facial aging and one of the key points of facial rejuvenation treatment. The mechanism of the formation of the declarations is complicated, mainly due to aging, which causes the skin to become thinner, the elastic fibers to decrease, the ligaments to lengthen and decrease in elasticity under the effect of gravity, the fat accumulation and the difference in tissue structure between the inner and outer side of the declarations, and the long-term repetitive movement of the expression muscle, which produces the downward relative displacement of the skin and subcutaneous tissue. According to its shape, it can be classified as concave, straight and convex; according to its cause, it can be classified as skin type, fat pad type, muscle type, bone recession type and mixed type. And according to its severity, it can be divided into 5 grades: none, mild, moderate, severe and very severe. The methods of removing decrepit lines mainly include sodium hyaluronate filler, autologous granular fat transplantation filler, photoelectric treatment, radio frequency, surgical lifting and various combined techniques. Simple filler method has better effect for simple depressed type of decrescent lines, and simple buried wire lifting or photoelectric treatment has certain effect for sagging skin, but the effect is short-lived. In the case of skin-type nasolabial folds, there is both sagging skin and local tissue volume loss, so surgical lifting of sagging skin and soft tissues combined with volume replenishment in the nasolabial folds area is the only way to get better results.