CT scan alone can detect lung lesions (e.g. emphysematous changes) but cannot confirm the diagnosis of chronic obstructive pulmonary disease, which usually requires a combination of pulmonary function tests, symptoms, and signs. Chronic obstructive pulmonary disease (COPD) is a disease characterized by persistent airflow limitation. It includes three pathological states, namely airway mucus hypersecretion, chronic bronchitis and emphysema. CT examination is generally not used for routine examination. High-resolution CT has high sensitivity and specificity for identifying lobular central or total lobular emphysema and determining the number and size of pulmonary bullae. Persistent airflow limitation in patients on pulmonary function tests is the gold standard for confirming the diagnosis of COPD. The diagnosis of chronic obstructive pulmonary disease generally also takes into account the history of smoking and the presence of a large amount of dust in the living environment. Clinical symptoms such as recurrent cough and sputum, especially dyspnea after activity. Early signs are not obvious, with the progress of the disease may appear barrel chest, early deep slow breathing, late shallow fast breathing, chest and abdomen contradictory movement. Patients with suspected chronic obstructive pulmonary disease are advised to seek timely medical attention to avoid aggravation of the disease.