Hemodialysis for patients with chronic renal failure generally requires a dialysis regimen of three times per week, with each dialysis session lasting 3-5 hours. Patients on hemodialysis need to adhere to the dialysis, and more patients in China are now taking dialysis three times a week. There is evidence that twice-weekly dialysis is less effective than three times a week, unless some patients still have more residual kidney function. The duration of each dialysis session is typically 3-5 hours, but more and more centers are also offering longer dialysis sessions (up to 8 hours per session), which may be relatively insufficient due to some dialysis technical problems. Patients need to strictly limit foods high in salt, strictly limit water intake, gain no more than 5% of their dry weight, and avoid foods high in potassium while on dialysis. How many days of dialysis for patients with chronic renal failure need to be individualized by the doctor according to the patient’s condition.