Bronchial provocation test is one of the pulmonary function tests, mainly used to diagnose bronchial asthma. Especially when the clinical symptoms of bronchial asthma are not typical and there are difficulties in diagnosis, this test will be used. Its main operation process is through the lung function test, after the normal lung function test value, inhalation of part of the drug induced bronchospasm. If the induced test data is reached, it suggests that the lung ventilation function has declined, and after the decline reaches a certain level, a positive bronchial provocation test can be diagnosed. Although the bronchial provocation test can be used to diagnose bronchial asthma, but positive does not necessarily suggest bronchial asthma, such as acute colds, bronchitis, some allergies, chronic bronchitis may be provoked test positive.