The chronic obstructive pulmonary oxygen standard is greater than 90% or more. Chronic obstructive pulmonary disease (COPD) is characterized by persistent airflow limitation, often manifested by shortness of breath, cough, sputum, dyspnea, etc. For patients with hypoxia, effective oxygen therapy improves the quality of life and survival rate, and has a good impact on the patient’s exercise capacity and mental status. The purpose of the treatment is to make the patient at sea level, resting state, to achieve the partial pressure of oxygen size equal to 60mmHg or blood oxygen saturation rises to more than 90%. Patients with chronic obstructive pulmonary disease are advised to go to the respiratory department of the hospital for treatment under the supervision of a doctor.