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 slightly longer.