Hemodialysis, there is no such thing as whether it is better to dialyze 2 times a week or 3 times a week, and the number of times should be formulated according to the specific conditions. 1. 3 times a week: it helps to remove the excess water and metabolic wastes in the body, avoiding 2 times a week may cause the excess water and metabolic wastes in the body can not be completely removed, and then induce edema and high blood pressure, nausea, vomiting and other toxic reactions. 2. 2 times a week: for patients with high urine output, good level of residual renal function, acute kidney injury, and elderly patients with emaciation, 2 times a week can be used, but pay attention to review whether there are electrolyte disorders, nausea, vomiting, difficulty in correcting high blood pressure, anemia, insomnia, etc., and at this time, it is mostly considered that dialysis is not sufficient, and it is necessary to increase the frequency according to the doctor’s prescription. It is recommended that dialysis patients should go to regular hospitals in time and choose the appropriate frequency of dialysis under the guidance of specialists.