If a patient with advanced lung cancer has respiratory distress, oxygen therapy is needed, which is generally continuous low-flow oxygen, that is, 1-2L/min oxygen flow, and this oxygen concentration can maintain the basic vital signs of the patient. If severe type I respiratory failure occurs, the oxygen flow rate needs to be increased, which can be around 3-5L/min, to ensure that the oxygen saturation indicated by cardiac monitoring is above 90%, and the partial pressure of arterial blood oxygen does not fall below 60mmHg, which means that the patient can get out of type I respiratory failure and try to avoid hypoxic conditions. Therefore, for patients with advanced lung cancer who have respiratory distress, in addition to giving oxygen, if there are serious infections and multiple complications, they also need to give non-invasive ventilator-assisted ventilation treatment in order to effectively improve the situation of hypoxia and respiratory failure.