Patients with chronic obstructive pulmonary disease have persistent airflow limitation and ventilation dysfunction. If high flow oxygenation can lead to over-inhalation of oxygen and inability to expel carbon dioxide from the body, resulting in carbon dioxide retention and further aggravating the disease symptoms in patients with chronic obstructive pulmonary disease. It is recommended that patients with chronic obstructive pulmonary disease receive continuous low-flow oxygen, especially those with fingertip oxygen less than or equal to 88% and oxygen partial pressure less than or equal to 55 mmhg on arterial blood gas analysis, and long-term, effective home oxygen therapy is very beneficial to patients. It is recommended that the duration of oxygen inhalation should be about 10-15 hours per day to improve the oxygen content required by the patient’s body and also to allow the body organs to be effectively supplied with oxygen so as to maintain the normal human physiological needs.