Patients with respiratory failure undergoing oxygen therapy should be treated differently depending on the type of respiratory failure. If it is Type I respiratory failure, it is simply hypoxia without accompanying carbon dioxide retention. Our oxygenation principle can provide slightly higher oxygen flow, with an oxygen flow rate exceeding 5 liters per minute. However, if it is Type II respiratory failure, which comes with severe carbon dioxide retention, it requires continuous low-flow oxygenation. This type of respiratory failure is often caused by chronic pulmonary diseases. Because if high-flow oxygen is provided, the peripheral chemoreceptors' response to hypoxia will decrease in the short term, which will exacerbate respiratory suppression, leading to increased carbon dioxide retention and worsening the condition. Therefore, for Type II respiratory failure, low-flow continuous oxygen should be provided, with an oxygen flow rate controlled below 3 liters per minute.