Laryngoscopy is mainly used to observe the oropharynx, laryngopharynx and larynx and laryngotracheal tubes, and is able to detect vocal polyps, laryngeal tumors, vocal nodules, congenital laryngeal webbing, laryngeal trauma and other disorders with distinctive surface features. Laryngoscopy includes indirect laryngoscopy, fiber optic electronic laryngoscopy, direct laryngoscopy and dynamic laryngoscopy, etc. Through laryngoscopy, injuries, foreign bodies and swellings in the oropharynx, laryngopharynx and laryngeal and laryngotracheal tubes can be visually observed, which can assist in the diagnosis of diseases of the pharynx and throat, such as vocal fold polyps, laryngeal tumors, vocal fold nodules, and laryngeal traumas. For patients with laryngeal symptoms such as laryngeal pain and hoarseness, laryngoscopy can be performed to help early detection of the disease, early treatment, and active consultation, so as not to miss the condition.