Commonly used laryngoscopes include indirect laryngoscopes, fiberoptic laryngoscopes and electronic laryngoscopes. Indirect laryngoscopes are accessed through the mouth, while fiberoptic laryngoscopes and electronic laryngoscopes can be accessed through the nose. Indirect laryngoscopy is performed as follows: first, the patient sits in a chair, opens his mouth and sticks out his tongue. The doctor wraps a clean gauze around the anterior third of the tongue, pulls the tongue forward and downward, and places the laryngoscope, slightly heated, in the patient’s oropharynx. The laryngoscope is heated slightly and placed in the patient’s oropharynx. The patient is then instructed to pronounce the word “coats,” and the doctor places the laryngoscope mirror downward to examine the structure of the larynx and pathological changes through the mirror image. Fiberoptic laryngoscopes and electronic laryngoscopes usually require anesthesia of the nasal mucous membranes of the nasal cavity and throat, and then the mirror is inserted into the nasopharynx along the floor of the nasal cavity or the middle nasal passages, and the angle of the mirror is adjusted to look at the epiglottis, the pars fossa, and the vocal cords. The process of laryngoscopy is shorter and produces less discomfort, which is a commonly used examination method in clinic, and it is convenient for the doctor to operate better after the patient relaxes.