Renal dialysis, or artificial kidney, is also known as hemodialysis. It usually needs to be done every other day or two days, i.e. three times a week for four hours each time. Renal dialysis is mainly used for patients with uremia. Patients have mostly lost the detoxification and drainage function of the kidneys and need to be maintained by renal dialysis. The mortality rate of uremia is high, and the emergence of renal dialysis effectively prolongs the survival of uremic patients. For normal people, the kidneys are in operation all day long, while for renal dialysis patients 24-hour renal dialysis is unrealistic, so treatment can be given every other day for 4 hours each time to maintain the basic physiological needs of uremic patients, thus reducing the occurrence of serious complications. When patients are in a hypometabolic state or have high urine output, the number of dialysis sessions can be reduced as appropriate, and close observation can be given. In addition, renal dialysis patients need to limit water intake and give a low-fat, high-quality protein diet, avoiding animal fat and spicy, stimulating foods.