There are two main methods of doing double eyelids without incision: first, continuous submerged lines. Second, interrupted buried thread. Continuous burying is done by surgical needle to sew the thread to the lid and then to sew the dermis, then to sew the lid and then to sew the dermis, and then to sew the lid and then to sew the dermis, routinely 3 groups of such adhesions between the lid and the dermis, which form the double eyelids when the eyes are opened. Intermittent sutures, which are also routinely 3 groups, are chosen to be inserted on the conjunctival surface, with stitches in the inner 1/3, middle and outer 1/3 of the conjunctival surface to form an adhesion between the lid and the dermis, thus also forming a double eyelid, an adhesion between the lid and the dermis, and thus a fold when the eyes are opened, which also conforms to the principle of double eyelids. Conventional interrupted buried line, also called Korean three-dot or called nano scarless double eyelid.