Acute renal failure is a clinical syndrome in which the urinary function of the kidneys is drastically reduced by the kidneys themselves or by extra-renal causes, resulting in a serious disturbance of the internal environment of the body. The main manifestations are oliguria or anuria, azotemia, hyperkalemia and metabolic acidosis. Prevention is a very critical step. 1, reasonable diet Low protein, low phosphorus and low fat diet, the protective effect of renal function in chronic kidney disease has been confirmed by laboratory and clinical. Currently, it is emphasized that in order to prevent the occurrence of acute renal failure, protein intake should be restricted when the blood muscle intoxication is 159.1 micromoliters. The application of angiotensin-converting enzyme inhibitors can not only control systemic hypertension, but also correct glomerular hyperperfusion and hyperfiltration, which has the effect of delaying the occurrence of acute renal failure. 3.Actively treat primary diseases Actively treat primary diseases such as acute and chronic glomerulonephritis, lupus nephritis, purpura nephritis or diseases that may involve the kidney (such as hypertension and diabetes mellitus) to eliminate these possible causes of acute renal failure, and then effectively prevent its onset.