Despite recent progress on hemodialysis acomplished by the aid of modern technology, no significant improvement in survival rate of acute renal failure has achieved yet. The author analyzed the factors influencing prognosis of 69 cases of acute renal failure since 1968. The overall survival rate was 63.8%. "renal" was 58.3%, "postrenal"-76%, "h epatorenal syndrome"-33.3 %, "DIC"-60%. The author divided the patients-renal 36 cases, hepatorenal syndrome 3 cases, DIC 5 cases-into four group

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... ng of the degree of severity of the underlying disease and uremic status. Grade A group consisted of patients with slight underlying disease and uremic status. Grade B group consisted of pati ents with severe underlying disease and slight uremic status. Grade C group consisted of patients with slight underlying disease and severe uremic status. Grade D group consisted of patients with severe underlying disease and uremic status. The mortality rates of Grade A, B, C and D were 15.8%, 66.7%, 50% and 87.5%. 6 patients of nostrenal 25 cases were dead. They were all endstage of malignant tumor.