1. A study on chest radiographic findings of 54 cases with pneumonia like symptoms was performed. of 54 cases, 8 cases were confirmed to be leptospirosis and 7 cases were leptospirosis combined with Korean hemorrhagic fever. 2. Of 8 cases of leptospirosis, 4 cases showed abnormal chest radiographic findings : acinar nodular type 2 , massive confluent consolidation type 2. Of cases of leptospirosis combined with Korean hemorrhagic fever : acinar nodular type 3 , massive confluent consolidation type1, and increased interstitial markings type 1 respectively. 3. It was considered to be difficult to diagnose the leptospirosis on chest radiographic findings alone, especially the case combined with Korean hemorrhagic fever.