The curvature of the nasal passage is mainly due to the deviation of the nasal septum. The only effective treatment for deviated nasal septum at present is to do surgery for correction, which can be handled by minimally invasive nasal endoscopic surgery. The surgery can be done by submucosal resection of the septum to remove the deviated bone, or by submucosal nasal septoplasty. Currently, the popular ones are submucosal trilinear subtraction and two-line subtraction, in which the connection between the rigid bone and cartilage that make up the nasal septum is disconnected, the curved part is removed, and the remaining cartilage and bone are put back together again, and the curvature of the nasal tract can be corrected.