The difference between bronchial asthma and chronic obstructive pulmonary disease (COPD) lies in the differences in age of onset, etiology, symptoms and signs, and pulmonary function. 1. Chronic Obstructive Pulmonary Disease (COPD): It is usually caused by smoking, infection, air pollution, genetic factors and other factors, which leads to persistent airflow limitation, and airflow limitation is irreversible, and shows progressive development, mainly manifested as chronic cough, sputum, shortness of breath or dyspnea and other discomforts, which can not be relieved by themselves, and it is common in middle-aged and old people. Usually, during the pulmonary function test, if the ratio of exhaled gas volume to expired lung capacity in the first second after inhalation of bronchodilator is less than 70%, it is clear that there is persistent airflow limitation, which can also be used as a diagnostic criterion for COPD; long-term home oxygen therapy and low-flow oxygen therapy are needed, and drugs such as aminophylline, tiotropium bromide, methylprednisolone, cefuroxime, etc., can be prescribed by the doctor if necessary. Treatment. 2. Bronchial asthma: It is a disease characterized by chronic airway inflammation and airway hyperresponsiveness, mainly due to allergic factors, infection, air pollution, genetic factors, etc. It is clinically manifested as recurrent attacks. Clinically, it manifests itself in recurrent episodes of wheezing, shortness of breath, chest tightness or coughing and other discomforts. They are usually worse at night and in the early hours of the morning and can resolve on their own. Usually can choose the bronchial stimulation test or diastolic test for diagnosis, bronchial diastolic test is mainly after inhalation of bronchodilator, the first second forced expiratory volume increase is more than 12%, and the absolute value of the first second forced expiratory volume increase is more than 200 milliliters, which is more common in adolescents and young people; if necessary, you can choose the glucocorticosteroid, salbutamol, terbutaline, leukotriene modifier and other drugs for treatment according to the doctor’s advice. Treatment. If the diagnosis of bronchial asthma or chronic obstructive pulmonary disease is confirmed, it is recommended to consult a respiratory physician in a timely manner, and treatment will be carried out after a comprehensive assessment of the condition by the physician.