Nasal catheter oxygen inhalation, a very common form of oxygen in otolaryngology, is mainly used for patients after pharyngeal cavity surgery, with the purpose of allowing oxygen to be inhaled through the nasal cavity rather than to the pharyngeal cavity to reduce bleeding after pharyngeal cavity surgery. There are the following clinical considerations for nasal catheter oxygen inhalation. First, when using oxygen, first adjust the flow rate, and then apply oxygen after the flow rate is adjusted. When stopping oxygen, the catheter should be removed first, and then the oxygen switch should be turned off to avoid a sudden rush of large amount of oxygen into the respiratory mucosa once the switch is turned on wrongly, which may lead to lung and tracheal injury of the patient. Second, the application must pay attention to observe whether the catheter is smooth and in place, often observe whether the patient has the performance of oxygen deficiency, whether the oxygen device has air leakage and so on. Patients who are frequently on oxygen should pay attention to the observation of the nasal catheter and replace it regularly. Patients may have dry nasal cavity, erosion and so on performance, to regularly give patients with compound peppermint brain nasal drops nose, keep the nasal cavity moist, to avoid dry nasal mucosa and lead to bleeding.