Cough variant asthma（CVA）and eosinophilic bronchitis（EB）are the most common causes of chronic cough. CVA patients are mainly characterized by airway hyperresponsiveness，while EB patients are mainly characterized by eosinophilic airway inflammation and normal lung function. The principal treatment of two diseases is inhaling corticosteroids，which can significantly improve the symptoms and prognosis of these two diseases. However，the association between the duration of ICS treatment and disease progression remains unclear，and there are also diversities in various guidelines. This article aimed at elaborating the different phenotypes and prognosis of CVA and EB，and analyzing the influence factors of the duration of ICS treatments on the prognosis of the diseases.