Bronchial asthma airflow limitation is a respiratory physiological feature of our bronchial asthma, and its limitation is mainly related to the pathophysiological mechanism of asthma. Asthma is a chronic airway inflammation involving multiple cells caused by various reasons. When inflammation occurs, the mucosa will become edematous, and the smooth muscle outside the airway will also spasm and contract. Therefore, the airflow cannot smoothly enter and exit the bronchi, leading to the manifestation of airflow limitation in the bronchi. Thus, in the treatment of asthma, we need to use some bronchodilator drugs, as well as some anti-inflammatory drugs, so as to comprehensively control the patient's symptoms.