The Chinese nose is characterized by a low starting point of the nasal root and insufficient height of the nasal bridge, often combined with a lower and shorter nasal tip, a thick nasal tip, a wide nasal wing base, a weak nasal column support, a large nasolabial angle, an upward rotation of the nasal tip point, and a skewed nostril, which affects the beauty of the whole face. As a stable supporting tissue, the nasal columella directly determines the height of the nasal tip and the shape of the nostril. The use of micro-injected materials, in collaboration with nasal septum cartilage, can strengthen the support of the medial wall of the nostril, strengthen the nasal columella, and increase the height of the nasal columella, thus achieving the purpose of increasing the height of the nasal tip and improving the shape of the nostril. However, the effect of nasal tip injection rhinoplasty is very limited in general and will disappear rapidly with time, meanwhile, it may be accompanied by the following risks 1, arterial embolism: the most common is that the material enters the nasal columella artery during injection, which will cause necrosis of the inferior lobule of the nasal tip and a small part of the nasal tip, manifesting as pale ischemia followed by necrosis; embolism of the nasal artery on the nasal side leads to skin necrosis of the upper part of the nasal tip of the nasal wing. 2, venous return obstruction: ① injection is too shallow, the injection volume is too large; ② local edema caused by material stimulation, compression of blood vessels affect blood flow; ③ if the patient has thick skin with poor elasticity and stretch, it is more likely to be complicated by swelling ischemia. 3, infection: ① simple infection, manifested as redness, swelling, heat, pain, if not treated in time will cause skin ulceration; ② sebaceous glands are well developed, secretion is strong, more likely to break down. 4, material-related problems: ① hyaluronic acid type (hyaluronic acid) has strong water-locking characteristics, which is theoretically more likely to cause swelling, ischemia and necrosis. ②Collagen is an exogenous biological material, which may cause swelling and redness when it enters the skin, and if it enters the blood vessels, it will cause platelet agglutination and lead to local vascular embolism. ③ Hydroxyapatite is a hydroxide compound of calcium phosphate, which is not easily dissolved in aqueous solvents and has a large tissue reaction.