Nasal endoscopic sinus surgery changes the traditional destructive surgery to a functional surgery that, according to the extent of the lesion, preserves the normal mucosa and structure of the nasal cavity and sinuses as much as possible on the basis of complete removal of the lesion, forms good ventilation and drainage channels, and promotes the recovery of the morphology and physiological function of the mucosa of the nasal cavity and sinuses, in order to cure sinusitis and nasal polyps by relying on the recovery of the physiological function of the nasal cavity and sinuses themselves, and to prevent The purpose of the procedure is to cure sinusitis and nasal polyps and to prevent recurrence. The development of this procedure and the advancement of CT scanning technology have led to fundamental changes in the treatment of nasal cavity and sinus lesions. Traditional sinus mucosal rhizotomy has been gradually replaced by mucosa-preserving sinus orotomy and drainage, and functional endoscopic sinus surgery has now become the mainstream for the treatment of nasal and sinus diseases. So which diseases are suitable for surgical treatment under nasal endoscopy? Chronic sinusitis, hypertrophic rhinitis, nasal polyps, nasal mycosis, sinus cysts, deviated septum, and some nasal tumors are all common and frequent diseases of the nose. As these diseases have the characteristics of easy recurrence and difficult to cure, they bring a lot of pain to patients and friends. These diseases are the main indications for nasal endoscopic surgery, and because of the advantages of accurate and minimally invasive nasal endoscopic surgery, the cure rate of the above diseases has been significantly improved and the pain of the patients has been reduced. In addition, with the rapid development of nasal endoscopic technology in recent years, the indications for nasal endoscopic surgery have been extended to nasal and ocular related diseases and skull base diseases, making the traditional surgery for related diseases develop into minimally invasive surgery. For example, chronic dacryocystitis, blindness caused by optic nerve injury, and pituitary tumor can also be operated under nasal endoscopy, which not only avoids the nasal and facial scars left behind by external nasal incisions, but also reduces the trauma of surgery.