Eosinophilic lung diseases are a heterogenous group of disorders that are still controversial about the classification of these disease entities. Generslly, chronic eosinophilic pneumonia is diagnosed after all possible causes of eosinophilic lung infiltration were excluded. Bronchial asthma is sometimes accompanied with eosinophilic lung diseases, such as allergic bronchopulmonary aspergillosis, Churg Strauss syndrome, bronchocentric granulomatosis, fungal infection, and chronic eosinophilic pneumonia. As the prognosis and management plans of these disorders sre different, accurate diagnosis of the causes of eosinophilie lung diseases is critical. Recently we experienoed two cases of chronic eosinophilic penumonia in bronchial asthmatics. One case was diagnosed by clinical features and pathology, and the other by clinical features and therapeutic trial.