The alar is too low, which can be manifested as the front, back or all alar edges drooping, and the side view can cover the columella, forming a false columella invagination deformity. Hypertrophy of the alar is more common in yellow and black people, often accompanied by drooping of the alar. Meilai can be improved by narrowing the nose. The conditions of alar reduction are quite different from the expected results, so comprehensive surgery is needed to divide the nose into deep fascia tissue, alar cartilage, nasal columella and nasal septum.