The results of pulmonary function tests include several major aspects, the first being pulmonary ventilation, the second being pulmonary ventilation, and for some pulmonary function reports, the results of pulmonary elastic resistance. The common diseases of pulmonary ventilation include obstructive lesions, and if patients have diffusion abnormalities, diffusion dysfunction can occur, for example, in interstitial lung disease, patients can have a decrease in diffusion function. The specific results need to be interpreted in the context of the patient’s symptoms and past medical history for a comprehensive analysis and judgment.