Double eyelids can be transformed into double eyelids through threading surgery, incision surgery and so on. 1. Surgery: Double eyelid surgery is also called polymer double eyelid surgery, which utilizes polymer threads buried in the upper eyelid skin to make the upper eyelid skin and the eyelid adhesive, forming a blepharoplasty effect, which is minimally invasive, with no scarring, and does not require removal of stitches after the surgery. 2. Incision Surgery: Incision eyelid surgery is performed through an incision in the upper eyelid to remove loose skin, orbicularis oculi muscle and hypertrophic fat, and then suture the skin and the orbicularis oculi muscle or the levator tendon membrane together to form a blepharoplasty effect, which is natural and long-lasting, but with a slightly longer swelling time. It is recommended that patients undergo the surgery under a professional doctor, etc.