Laryngoscope clinical class is more, different types of inspection methods are different, such as indirect laryngoscope, fiber laryngoscope, electronic laryngoscope, etc., both from the nose into the mouth into the tube fiber laryngoscope, electronic laryngoscopy, dynamic laryngoscopy, stroboscopic laryngoscopy, etc., and the inspection effect is usually the same. The so-called from the nose into the so-called mirror tube probe from the front nostrils inserted through the nasal passage, nasopharynx, and then down to the oropharynx to laryngopharynx and other parts. From the mouth into refers to the mirror tube probe from the oral cavity into the turn downstream directly into the observation of the oropharynx, laryngopharynx and laryngeal cavity of the structure and activity of the various parts. Laryngoscopy from the nose into the mouth into the same effect, the specific operation and precautions with the type of laryngoscope and similar, the patient should be under the guidance of the doctor to choose the appropriate method of examination.