1. thread embedding method: directly embed the suture (or polymer suture) between the skin and the meibomian, so that the skin of the upper eyelid adheres to the meibomian to form a double eyelid. This method is simple to operate, with little trauma, no scar, rapid swelling reduction and no need to remove stitches. More suitable for young people, with thin eyelids, long eyes and no loose skin. Not suitable for people with thick eyelids, loose skin and older age, double eyelids may disappear. 2. Double eyelid incision: It 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 can be used to adjust the upper eyelid structure, and the effect is reliable and lasting, and it is suitable for single eyelid in various situations.