The levator palpebrae superioris muscle fibers of the double eyelids are attached to the upper edge of the eyelid plate, and some fibers pass forward through the orbicularis oculi muscle and attach to the upper eyelid skin 4-7 mm away from the eyelid edge. When the eyes are open and the levator palpebralis muscle contracts, the skin in this part is pulled upward, while the upper skin is relatively drooping, thus forming skin folds, that is, double eyelid folds. People with single eyelids generally have no fibers attached to the eyelid skin and no wrinkles. For example, hang a thin curtain and sew a point on the lower part of the curtain with thread to fix it. When the fixing thread is pulled up, the lower part of the curtain will wrinkle. When the curtain is pulled up, there is a certain gap from the ground. This is why double eyelid surgery's eyes get bigger. If the curtain is wide, when the curtain is pulled up, the upper part of the fixed point will cover up the wrinkles. This is why people with slack eyelids are not easy to sew double eyelids and bury double eyelid surgery. If the curtain is a thick quilt, pull it up at a fixed point at the same height, and you will find that the upper part bulges into a thick bag, and the lower part is wider than when the quilt is thin, which is why people with thick eyelids need to remove fat and muscles when making double eyelid surgery, and the design line of double eyelids is low. Double eyelid surgery can be roughly divided into two categories: suture method and incision method. Suture is suitable for those with thin eyelid skin, large eye fissure or slight skin relaxation. Generally speaking, young people can consider this method except those with enlarged eyelids. Incision method is suitable for all kinds of single eyelids. It is especially suitable for people with loose skin and enlarged eyelids. Generally, middle-aged people consider this method. Double eyelid surgery, a plastic surgery hospital of Shandong Weifang Medical College, has rich experience and is guaranteed by state-owned hospitals.