It is possible for single eyelids to become double eyelids, especially in infancy, and it is more common for single eyelids to become double eyelids, but most are related to genetics. Some people also have single eyelids that turn into double eyelids in their youth as they grow older. If in adulthood, the single eyelid still does not become double eyelid, the candidate can also do cosmetic surgery. This is a simple procedure with little trauma, no scarring, fast swelling, and no stitching; 2. This is a minimally invasive method, sometimes with two small incisions or even one small incision, and tissue removal after the incision, followed by suturing, thus forming double eyelids; 3. Full incision method: after all the upper eyelids are incised, according to the degree of skin laxity, certain fat and muscles are removed, and if necessary, certain skin is removed, after which the double eyelids are formed by suturing.