Mild COPD is defined as FEV1/FVC<70% after bronchodilator inhalation in patients with COPD and FEV1 as a percentage of predicted value ≥80%. Patients with mild COPD experience wheezing with strenuous activity in the stable phase, and wheezing with walking on level ground in the acute exacerbation phase. Chronic obstructive pulmonary disease (COPD) is characterized by persistent respiratory symptoms and airflow limitation, usually associated with airway or alveolar abnormalities caused by significant exposure to harmful particles or gases. In patients with mild chronic obstructive pulmonary disease, symptoms of shortness of breath, dyspnea, and wheezing usually occur only during strenuous activity during the stabilization period. Patients are advised to quit smoking, strengthen physical exercise, enhance physical fitness, and improve body immunity, which can slow down the decline of lung function. Suffering from chronic obstructive pulmonary disease is recommended to go to the hospital for early and regular treatment.