This is a permanent double eyelid operation, which removes loose skin, orbicularis oculi muscle and fat through incision, and directly sutures the skin with orbicularis oculi muscle or levator palpebrae aponeurosis under direct vision to form double eyelid. This method needs to cut the skin, which is slightly traumatic, but the upper eyelid structure can be adjusted through the incision, and the effect is reliable and lasting, which is suitable for single eyelid in various situations. The swelling time is a little longer, and the wound will leave a linear scar. & ltbr/>； Incision is suitable for all cases, which can cut loose upper eyelid skin, remove excess orbital septum fat and deepen orbital fossa, and the operation effect is lasting. The disadvantage is that the operation is complicated and traumatic, and it will take some time for the edema to subside after operation.