Obstructive pulmonary ventilation dysfunction, mainly refers to a decrease in gas flow rate due to obstruction or narrowing of the airway. Pulmonary function index is FEV1/FVC less than 70%, the diagnosis of obstructive pulmonary ventilation dysfunction. Common diseases such as chronic obstructive pulmonary disease, acute phase of bronchial asthma attack, etc. It is not well understood by the general public, it is like the balloon mouth is blocked, the gas cannot come out, which is equivalent to obstruction. The reason may be foreign body blocking the mouth, or it may be because of the narrowing of the balloon mouth caused by various reasons itself, resulting in airway obstruction, specific diseases should be analyzed.