Chronic Obstructive Pulmonary Disease, abbreviated as COPD, is caused by chronic airway inflammation that results in congestion, edema, excessive mucus secretion by inflammatory cells, narrowing of the airways, obstruction, and restriction of airflow passage during breathing, which is incompletely reversible and progressively aggravated, and systemic adverse effects, such as osteoporosis, malnutrition, and malaise, etc. It is preventable and treatable, but it can be prevented and treated. But it is preventable and treatable. The main cause of the disease is smoking, followed by environmental pollution. Harmful gases and particles inhaled stimulate a series of inflammatory reactions in the airways, producing inflammatory factors, free radicals, and upsetting the balance of substances in the airways, and irreversible inflammatory reactions occur in the airways. Smoking cessation is a major part of the prevention of chronic obstructive pulmonary disease (COPD). Chronic obstructive pulmonary disease is mainly caused by chronic bronchitis, obstructive emphysema and bronchial asthma that are not treated in a timely and effective manner and continue to aggravate, so active and effective prevention and treatment of the above diseases can reduce the occurrence of chronic obstructive pulmonary disease. Chronic bronchitis and obstructive emphysema 80% related to smoking, quit smoking is an important factor in prevention. Increasing exercise to improve physical fitness is an indispensable lifestyle for disease prevention. Chronic obstructive pulmonary disease (COPD) is characterized by cough, sputum, dyspnea with progressive aggravation, decreased activity tolerance, and eventually respiratory failure, chronic pulmonary heart disease and pulmonary encephalopathy. Lung function is an important indicator for the diagnosis of COPD: a one-second rate of less than 70% indicates that COPD has developed, and the change of one-second volume is a judgment of the severity: more than 80% is considered as mild; 80%-50% is considered as moderate; 50%-30% is considered as severe; and less than 30% is considered as very severe. Arterial blood gas analysis is to determine the amount of hypoxia and/or carbon dioxide in the arterial blood. Respiratory failure is diagnosed when the arterial partial pressure of oxygen is less than 60 millimeters of mercury (mmHg) and/or the partial pressure of carbon dioxide is more than 50 mmHg. Chronic Obstructive Pulmonary Disease (COPD) is a common and frequent disease and is brought to the attention of patients for early diagnosis and treatment. Treatment depends on the condition. It is recommended to go to the hospital for diagnosis and treatment plan.