Intubation refers to tracheal intubation, which is the insertion of a plastic tube through the mouth or nasal cavity into the trachea. With this catheter, the physician can easily administer anesthetic gas into the patient’s lungs without bypassing the oral or nasal cavity to obscure such as the tongue. The catheter can prevent secretions from the oral and nasal cavities from reaching the trachea, but tracheal intubation is an invasive operation that has its indications, as follows: 1. Patients who need mechanical ventilation when their spontaneous breathing suddenly stops or when they cannot meet the ventilation and oxygenation needs of the organism; 2. Patients who cannot remove secretions from the upper airway, whose stomach contents are prone to reflux or bleeding, and who are at risk of aspiration at any time; 3. Patients who have Patients with upper airway injury stenosis, obstruction or tracheoesophageal fistula affecting normal breathing, acute respiratory failure or pericentral respiratory failure, etc. Inhalation anesthesia refers to a type of anesthesia. There is a connection between inhalation anesthesia and tracheal intubation, but there is no necessary connection between the two. The need for intubation is related to the patient’s condition and surgical needs, in general. Inhalation anesthesia requires intubation for the following reasons: 1, after anesthesia, there is usually respiratory depression, that is, their own gas is not enough, usually need artificial ventilation, or anesthesia machine assisted ventilation, then tracheal intubation becomes necessary, inhalation anesthesia to be absorbed through the lungs, acting on the nervous system, producing anesthesia, there is a tracheal intubation, to facilitate the entry of anesthetic gas into the lungs, but also to reduce the anesthetic gas leakage on surrounding personnel; 2, to reduce secretions, sputum blocking the tracheal tube, in case there is reflux of food or digestive juices in the stomach, can also be blocked out by the tube, not to contaminate the trachea, resulting in tracheal spasm or burn lungs; 3, in addition to timely oxygen supply in emergency situations. So in most cases inhalation anesthesia is to be tracheally intubated.