Objective To investigate imaging technology and imaging finding in pulmonary aspergilloma.Methods Chest radiography,X-ray tomography and CT were perfovmed in 15 cases of pulmonary aspergilloma confirmed by pathology and the imaging results were compared with pathology.Results The accuracy was 60% for chest radiography,80% for chest radiography and X-ray tomography,93.3% for chest radiography and CT.“Air crescent sign” or “air ring sign” were shown in 9 patients.The fungus ball could move with the change of patient's body position in 5 cases. Conclusion A mobile intracavitary mass with “air crescent sign” or “air ring sign” is the imaging characteristics of pulmonary aspergilloma.