At present, the double eyelid technology is very mature, and the most basic ones are catgut embedding and incision, which are very natural and safe to make. The catgut embedding double eyelid is suitable for people with tight upper eyelid and less fat. It is not permanent, but it recovers quickly and is minimally invasive. The incision is suitable for people with loose upper eyelid and fat, and it is permanent and natural to recover.