Background: Occasionally, CHF with severe left ventricular(LV) dysfunction came to be restored. Clinical characteristics in CHF patients with reversible LV systolic dysfunction(RLVSD) has not been elucidated. Subjects and Methods :Clinical findings of 75 patients with RLVSD from consecutive 486 patients with severe LV systolic dysfunction initially diagnosed as DCMP were analyzed. Severe LV systolic dysfunction was defined as LV end-diastolic dimension(LVED) above 60mm and LVEF below 25%. Complete RLVSD was defined as LVED reduced to 55mm and improved LVEF above 45% and partial RLVSD as LVEF>45% but LVEDd >55mm. Results: Mean follow up period was 23+/- 12 months. Fifteen percent of patients with severe LV systolic dysfunction recovered LV systolic function. Underlying diseases of RLVSD were ischemic cardiomyopathy(21.3%), hypertensive cardiomyopathy(29.3%), tachycardia induced cardiomyopathy(29.3%) and dilated cardiomyopathy(12%), other diseases include 3 cases of alcholic cardiomyopathy and 1 case of aortic valve replacement. Conclusion; RLVSD was not rare in patients with severe LV systolic dysfunction and also different underlying diseases had similar recovery pattern except T-CMP.