Pulmonary function tests require registration with the Department of Respiratory Medicine. Pulmonary function tests are commonly used as functional tests in respiratory medicine and are important in the diagnosis of bronchial asthma, chronic obstructive pulmonary disease, pulmonary heart disease, pulmonary fibrosis, lung abscess, and lung cancer. A thorough assessment of the status of pulmonary function can provide insight into whether a patient can be treated surgically and the patient’s prognosis. If a patient’s pulmonary function tests suggest ventilatory dysfunction, restrictive dysfunction, or mixed ventilatory dysfunction, the patient needs to be given the necessary medications. Glucocorticoid nebulizer inhalation should be considered for anti-inflammation, antispasmodic and asthma, and oxygen machine is always available at home to improve the patient’s lung function status, reduce the occurrence of pulmonary hypertension and delay the aggravation of pulmonary heart disease. Therefore, pulmonary function is mainly done by the Department of Respiratory Medicine, and the respiratory physician will guide the patient to perform pulmonary function operations to obtain accurate pulmonary function data to guide the clinical medication.