Abstract: Objective: To investigate the morphological manifestation and the diagnostic value of fibrobronchoscopy in pulmonary mycosis.Methods: The clinical data and the fibrobronchoscopy results of 21 cases with pulmonary mycosis were analyzed retrospectively.Results: Twenty-one pulmonary mycosis cases were enrolled,cough or expectoration was the main symptom,followed by hemoptysis,febricity or chest distress rare.Chest imaging results were shown:3 cases of atelectasis,3 cases of nodules,12 cases of tumor,4 cases of lamellar and patchy shadow and one of endobronchial nodule.The morphological manifestation of fibrobronchoscope were shown that 14 cases with neoplasm(including 12 neoplasms' surface covered with gray necrosis),5 with sphacelus in tracheal cavity,one with tube wall mucosal nodular eminence,and one patient was no obvious abnormality.Twenty-one cases were confirmed with the diagnosis of pulmonary mycosis by pathology through fibrobronchoscopy biopsy,including 7 cases with lung cancer.Conclusions: There were different morphological manifestations of fibrobronchoscopy in pulmonary mycosis,and no specificity.Obtaining the pathological specimens of lung by fibrobronchoscopy played an important role in the diagnosis of pulmonary mycosis.