To confirm the diagnosis of chronic obstructive pulmonary disease, relevant laboratory tests and imaging tests, as well as pulmonary function tests should be done. Specifically as follows: 1, laboratory tests are usually routine blood, blood-reactive protein, blood sedimentation and other infection-related factors, but also sputum smear and sputum culture, to understand the pathogenicity of the situation; 2, imaging tests are usually done chest radiographs and CT examination of the lungs, and through the imaging to determine whether there is chronic bronchitis, such as thickening of the texture of the lungs, disorders, and whether there is emphysema manifestations, such as hyperventilation, widening of the rib gap, etc.; 3, the pulmonary function test is very important, and patients with chronic pulmonary resistance to measure lung function, like hypertension patients to measure hypertension, and pulmonary function tests. It is very important to do pulmonary function test, which is just as important as blood pressure test for patients with hypertension to assess the degree of chronic obstructive pulmonary disease, and it is also an indicator to assess whether or not the treatment is effective and how effective the treatment is. Lung function tests for patients with chronic obstructive pulmonary disease (COPD) should always be accompanied by a non-invasive test, but many patients tend to ignore lung function tests. However, many patients tend to ignore the pulmonary function test. Therefore, patients with chronic obstructive pulmonary disease must be evaluated for pulmonary function.