Oxygen inhalation therapy is mainly divided into low-flow oxygen inhalation and high-flow oxygen inhalation, both of which are required for oxygen delivery, mainly according to the patient’s medical needs. For low-flow oxygen inhalation, the concentration of inhaled oxygen will vary with the flow rate of inhaled oxygen, the patient’s tidal volume, and the patient’s respiratory rate. Commonly used oxygen delivery devices include nasal cannula or nasal plugs, as well as mask delivery methods. There are also high-flow oxygen delivery methods that can provide sufficient oxygen for the patient’s needs, and the patient’s breathing pattern does not have a direct effect on the oxygen concentration. The commonly used methods are mask oxygenation and face mask oxygenation, both of which can provide a constant oxygen concentration, but the oxygen consumption is large and the equipment is relatively complex, which will have a certain impact on the patient’s life. The other is the method of mechanical ventilation, which is mainly for patients with acute and critical illnesses and relatively serious conditions.