With the help of good illumination of endoscope and supporting surgical instruments, the operation can be more precise. The traditional destructive surgery of radical or thorough scraping of nasal sinus mucosa is transformed into a functional surgery that preserves the normal mucosa and structure of nasal sinus as much as possible on the basis of thorough removal of lesions, forms good ventilation and drainage, and promotes the recovery of nasal sinus mucosa morphology and physiological function. According to the severity of the lesion, rhinitis, sinusitis and nasal polyps can be cured through the recovery of their own physiological functions. Because of its strong light conductivity, multi-angle and large field of vision, it can directly peep at many important parts of the nasal cavity (such as the openings of various sinuses, various ditches, hidden strictures in sinuses) and subtle lesions in the nasopharynx. In addition to surgical treatment, you can also take photos to save information for consultation, teaching observation and scientific research summary. This method has the advantages of less trauma, less pain during and after operation, thorough operation and fine operation. Endoscopic surgery can not only completely eliminate rhinitis, sinusitis and nasal polyps, but also correct the deviation of nasal septum at the same time, thus reducing the postoperative recurrence rate.