Normal people cannot do dialysis, and the dialysis referred to here is hemodialysis. The indications of hemodialysis mainly include: a. Acute renal failure. The renal function decreases sharply in a short period of time due to various reasons, and the blood creatinine and urea nitrogen increase progressively, which can be manifested as high catabolic state, and the daily increase of blood creatinine is more than 24.6 μmol/L. 2. Chronic renal failure. Chronic renal failure to the level of end-stage renal disease is glomerular filtration rate less than 15 ml/min. In addition, severe hyperkalemia, metabolic acidosis, cardiac failure that can not be corrected by internal medicine, as well as oliguria for 48 hours and anuria for 24 hours are also indications for dialysis. C. Severe acid-base imbalance, electrolyte disorders. Drug intoxication.