Double eyelid surgery is a routine cosmetic surgery whose main purpose is to improve the appearance of the candidate. At present, the technology of double eyelid surgery is very mature and the surgery itself is not harmful and the risk is relatively small. However, any surgery has its risks and may result in complications, which can be divided into intraoperative and postoperative complications, as follows: 1. Intraoperative complications: if there is damage to the peripheral nerves, muscles and blood vessels, this can result in hematoma and weakness in opening the eyes, etc. When there is damage to the deeper skin around the eyes, this can lead to a rupture of the levator muscle, causing the muscle to lose its supporting force and triggering symptoms of drooping eyelids; 2. Postoperative complications: both eyelids If the eyelid line is asymmetrical or disappears, the eyelid line is too wide or too thin, as well as swelling, infection, and scarring, once infection occurs, it will lead to poor wound healing and irreversible consequences, especially after scar formation, it will be difficult to achieve the required aesthetic effect of the double eyelid. The majority of candidates should go to a regular medical institution, choose a physician with a license to perform surgery, and follow medical advice to strictly carry out the correct post-operative care in order to improve the safety of surgery.