Double eyelid refers to a fold in the skin of the upper lid above the lid margin; the skin below this furrow moves up when the eyes are open, while the skin above this furrow is lax and hangs downward at the heavy lid furrow. To form a beautiful pair of double eyelids, one must take into account the alignment, width, upper lid swelling, lid width, lid margin curvature, the ratio between eye height and width, and eyebrow-eye spacing. There are three main surgical methods for double eyelids, namely incision, buried line, and Korean three-point Korean one point, of which buried line double eyelids are most suitable for those with thin eyelids and non-flaccid skin, because there is no need to remove excess fat tissue and skin, and the heavy eyelid effect can be formed through buried line. This is because it does not require the removal of excess fatty tissue and skin, and the eyelid is created by suturing polymer sutures between the skin dermis and the lid plate, artificially creating an adhesion between the upper eyelid skin and the lid plate, thus creating a double eyelid effect. Buried eyelids have the advantages of quick recovery, minimal trauma, short surgery time, and recoverability. However, the scope of application is narrower and more specific, requiring thin eyelids that are not flaccid, without removing excess fat and skin. The post-operative effect is more natural and beautiful without surgical traces. The specific type of double eyelid, such as parallel, open fan, European type, etc., needs to be considered according to the local and overall conditions of the eyes.