Moderate obstruction of tidal respiratory function generally indicates moderate obstructive changes in the airway, which is commonly seen in variant asthma. Tidal respiratory function test should be examined in a calm state, through the cycle analysis to obtain the lung tidal respiratory gas flow-volume curve relationship graph, reflecting the airway respiratory function status, because this test is non-invasive, easy to operate, the patient’s degree of cooperation is not required, commonly used in infants and young children tidal function test, moderate obstruction suggests that there are stenosis, obstruction, blockage and other obstructive changes in the airway. Moderate tidal respiratory function obstruction is commonly seen in variant asthma, bronchitis, bronchiectasis, emphysema, and bronchial foreign bodies. Usually, bronchodilators are used to improve airway resistance in most of these diseases. Bronchial foreign bodies are usually treated with Heimlich maneuver, and if the foreign body cannot be coughed up, bronchoscopic removal is performed immediately at the nearest hospital. In addition, tidal respiratory function is also used to check tidal respiratory function before and after thoracic and abdominal surgery, as well as preoperative pulmonary function indicators and postoperative disease recovery. Patients with moderate tidal respiratory function obstruction are advised to seek prompt medical attention in order to avoid delaying their condition.