The placement of an oropharyngeal airway mainly involves choosing an appropriate oropharyngeal airway and placing it in the mouth and behind the base of the tongue. Oropharyngeal airway is mostly used for those who have tongue drop and airway obstruction after anesthesia. The placement method may be slightly different in different regions and hospitals, or different placement methods may be chosen according to the patient’s condition. 1. Choose the appropriate oropharyngeal ventilation tube: The oropharyngeal ventilation tube mainly plays the role of preventing the tongue from falling back and blocking the airway, as well as maintaining the airway open. Therefore, the length of the oropharyngeal tube should be equal to the length of the incisor to the angle of the mandible. 2. Into the oral cavity: open the patient’s oral cavity, use the tongue hook to lift the tongue, so that the root of the tongue leaves the posterior pharyngeal wall. At this point, the oropharyngeal ventilation tube can be placed into the oral cavity, generally to the end of the incisor only 1~2cm away from the front end of the ventilation tube to reach the posterior wall of the pharynx. 3. Placement behind the root of the tongue: Hold up the lower jaw with both hands to ensure that the root of the tongue leaves the posterior pharyngeal wall, and then continue to feed the oropharyngeal tube inward for 2 cm, so that the curved portion of the airway is located behind the root of the tongue. After placement is complete, the oropharyngeal airway should be secured, the jaw relaxed, and the tongue or lips checked for entrapment between the incisors and the airway.