Hemodialysis refers to the process of removing toxins from the blood by various means to achieve its own water-electrolyte balance. Hemodialysis includes hemoperfusion, hemofiltration, continuous bedside hemofiltration, high-flux dialysis, low-flux dialysis, etc. Usually patients with chronic renal insufficiency are mostly treated with hemodialysis. High-flux dialysis requires higher requirements for water and dialyzer, etc. The addition of bacterial filter after the machine is not easy to occur infection, which is relatively better than low-flux dialysis, and is recommended for patients who have conditions.