The ptosis of the upper eyelid is caused by the relaxation of elastic fibers, thinning of dermis, atrophy of collagen and gravity. In addition, the joint of levator muscle fascia and skin plate is gradually stretched, which leads to the weakening of contraction force of levator muscle fascia and ptosis. The reason for all this is the weakness of the upper eyelid muscles. For ptosis, "eyebrow lifting" and "double eyelid surgery incision" can be used to improve it.