Compensatory emphysema is a normal physiological process, because the total area of the lung decreases after partial lung resection, and in order to ensure the body’s oxygen needs, the other side of the lung becomes compensated for the expansion, thus forming compensatory emphysema. Generally, compensatory emphysema is asymptomatic. However, if the lung loses this function, it is non-compensatory emphysema. How to effectively prevent compensated emphysema? COPD is a preventable and treatable disease characterized by airflow limitation, which is not completely reversible, progressive and related to the abnormal inflammatory response of the lungs to harmful gases or particles such as cigarette smoke, etc. COPD mainly involves the lungs, but can also cause systemic (or extra-pulmonary) adverse effects. Second, avoid environmental pollution Avoid various pathogenic factors, especially smoking, environmental pollution, colds, etc. Avoid the inhalation of dust and irritating gases; pay attention to warmth, change the poor lifestyle, and improve the living environment if possible. Third, drug treatment 1, bronchodilators. Compared with oral drugs, inhalation agents have less adverse reactions, so inhalation therapy is preferred. 2.Glucocorticoid. This treatment can reduce the frequency of acute exacerbations and improve the quality of life. Combined inhaled glucocorticoids and β2 agonists are more effective than each alone. Long-term oral glucocorticoid therapy is not recommended for COPD patients. 3.Other drugs. (1) expectorants (mucolytics), (2) antioxidants, (3) immunomodulators, (4) vaccines, (5) herbal treatments. Four, long-term home oxygen therapy Long-term home oxygen therapy is very important for people who are hypoxic, hypoxia requires supplemental oxygen, what time period hypoxia should be what time period supplemental oxygen. Oxygen saturation below 90% must be long-term home oxygen therapy, below 91-95% is best long-term home oxygen therapy, long-term home oxygen therapy is generally through the nasal catheter inhalation of oxygen, the flow rate of 1.0 ~ 2.0L/min (as prescribed by the doctor), oxygen duration period to cover the time period of oxygen deficiency, sleep period must be oxygen. Long-term home oxygen therapy should use oxygen machine for oxygen therapy, not ordinary oxygen machine.