Double eyelid surgery left no trace, that is, buried the thread. Thread embedding double eyelid operation is to embed thread (or polymer suture) between the levator palpebrae aponeurosis and the upper eyelid dermis at the upper edge of the upper eyelid plate, so that the upper eyelid skin can be connected with the levator palpebrae superioris muscle and the tarsal plate to form double eyelid. It is suitable for young people with large eyelid fissure, thin eyelid, normal eyelid skin tension and no epicanthus.