Both mask and nasal cannula oxygenation are commonly used in clinical practice. If the patient is severely hypoxic and needs a constant oxygen concentration, after major surgery or in coma, it is better to choose mask oxygen, which can provide a more constant concentration of inhaled oxygen, can wet oxygen, and has less irritation to the nasal mucosa, but will have some influence on eating and drinking. Nasal catheter oxygen is simple, convenient, comfortable, inexpensive, and does not interfere with eating and drinking, but it may be affected by breathing and activity, and the oxygen concentration is not fixed.