I. What is nasal endoscopic surgery? The nasal endoscopic technique is the surgical management of the nose or sinuses using an optical endoscope. The procedure has a clear field of view, complete removal of the lesion, minimal surgical trauma (minimally invasive) and normal postoperative nasal function. The nasal endoscopic technique is a revolutionary change in rhinology, which became popular internationally only in the 1980s, and was carried out at Zhongshan First Hospital in the 1980s under the leadership of President Xu G. Gan Jiayu, who was one of the first doctors to come into contact with the nasal endoscopic technique, has rich clinical experience and passed the technique to our hospital district so that every doctor has high skills in nasal endoscopic surgery. Comparison of endoscopic surgery and traditional sinus surgery. Traditional open sinus surgery requires an incision in the lacrimal groove or face, bone chiseling or cutting away the functional turbinates, unclear vision when clearing the lesion during surgery, easy to cause other injuries, excessive scraping of the mucosa during surgery resulting in slow recovery after surgery, nasal function will be affected, nowadays, except for malignant sinus tumors, this traditional surgery is generally not done. The nasal endoscopic surgery does not have the above-mentioned shortcomings, but only requires minimally invasive surgery through the nostril, no dead angle, no bone chiseling and turbinate removal, preserving the mucosa, fast recovery, good nasal function, less side effects, less pain, etc. The surgery is thorough and not easy to recur after surgery, which is the most ideal method for treating sinusitis and nasal polyps. Besides sinusitis and nasal polyps, nasal endoscopy can also be used to: ① Diagnose early nasopharyngeal cancer. ②Search for nasal bleeding points and benign and malignant masses, and perform surgical treatment. ③Correction of nasal septum deviation. ④Surgical treatment of allergic rhinitis. ⑤ Excision of nasopharyngeal adenoid hypertrophy. (6) Nasal lacrimal sac anastomosis (no facial incision). ⑦Decompression of optic nerve trauma. (8) Repair of cerebrospinal fluid nasal leakage, etc. IV. What tests should be done before nasal endoscopic sinus surgery? Before surgery, routine blood, blood type, urine routine, liver function, biochemistry, coagulation four, chest X-ray, electrocardiogram, etc., and most importantly, sinus CT photos, so that the doctor can determine the scope of the lesion, as well as intraoperative positioning and guide the direction of surgery, etc. V. Why do we need to review several times after nasal endoscopy: nasal endoscopy is a minimally invasive surgery, only part of the sieve area and open sinus opening, due to the small scope of surgery after the operation is easy to cause adhesions or vesicle growth, which will lead to unsatisfactory surgical results, such as post-operative review on time to the operation cavity epithelialization is good, then it can be cured.