Simple chest films of 106 cases of hemorrhagic fever with renal syndrome (HERS) were reviewed retrospectivelywith clinical sequences. Renal type of Pulmonary edema(n=6), pulmonary congestion (n=3), pleural effusion (n=3),cardiomegaly (n=1) and subcutaneous emphysema (n=1) were the findings of thoracic manifestation of HERS in orderof frequency. Pulmonary edema and congestion were noted in oliguric and diuretic phases and noticeably seen whenthe oliguric phase was prolonged for more than 7 dats(average oliguric phase, 3.3 days). Pleural effusion andcardiomegaly were also noted in oliguric and diuretic phases. Subcutaneous emphysema appeared in the diureticphase. BUN/Cr level, EKG finding and platelet count didn't contribute ot the thoracic findings. The type ofpulmonary edema, in conjunction with the prolongation of the duration of oliguria and phase of revelation ofthoracic findings suggest that fluid over load play a siginificant role in thoracic manifestation of HERS.