Hyaluronic acid is made in China and imported, with long-term and short-term effects, small molecules, middle molecules and macromolecules. The brand and model of rhinoplasty are different, and the maintenance time is different. For example, small molecules of hyaluronic acid can last for 6-8 months, while large molecules of hyaluronic acid are 10- 12 months, or even 12- 16. It is suggested that hyaluronic acid with high polymer, high viscoelasticity and high supporting force should be selected for rhinoplasty, which can make the back of nose have good supporting force and maintain the nose shape.