The nasal root is a bony part, which consists of two nasal bones and maxillary nasal process. The bridge of the nose is between the root of the nose and the tip of the nose, and consists of two pieces of nasal cartilage. The tip of the nose is the terminal part of the nose, which is mainly composed of two alar cartilages. Each alar cartilage has a medial foot and a lateral foot. The two medial feet form nasal columella and nasal tip bracket under the tip of the nose, while the lateral feet form two alars on the left and right sides of the tip of the nose, and there is nasal septal cartilage on the north side of alar cartilage. The external structure of the nose is from the root of the nose to the columella of the nose, forming a prominent triangular pyramid. The skin covering the upper two-thirds of the nose is slack and elastic, and the skin is easy to stretch and expand; The skin covering the lower third of the nose is closely attached to the subcutaneous tissue below, so it is not so easy to stretch and expand the skin. Nasal aesthetic standards: nasal aesthetics should be examined from different angles. The observation on the base plane should be an equilateral triangle. The following nasal features should be evaluated in lateral view: nasal frontal angle, turning point of upper nasal tip area, expression point of nasal tip and nasal columella-upper lip angle. The angle between the tip of nose and columella-upper lip angle is columella-lobular angle. The ratio of nose length to nose tip protrusion is close to 1:0.67.