There are four main criteria for grading ENT surgery: First, the surgical difficulty is low, the surgical process is very simple, and the risk is very small. Such surgeries are commonly associated with vocal cord polyp removal surgery, submucosal nasal septal scratching, and preauricular fistula removal surgery. Second, the surgical difficulty is average, the surgical process does not need to be too complicated, the risk is medium level surgery, the clinical common are nasal endoscopic sinus opening surgery, including maxillary sinus, frontal sinus, sieve sinus, etc., and tracheotomy, etc. Third, surgical procedures that are more difficult, complicated and risky during surgery, clinically common are nasal endoscopic nasopharyngeal fibrovascular tumor resection, laryngeal cancer, including hemilaryngeal, horizontal hemilaryngeal and vertical hemilaryngeal resection, nasal endoscopic cerebrospinal fluid nasal leak repair surgery, etc. Fourthly, surgical procedures that are particularly difficult, very complicated and risky, clinically common are auditory neuroma resection, jugular vein bullae resection, cochlear implant surgery, hypopharyngeal cancer, gastric substitution esophagus and other relatively large surgeries.