Blood purification and dialysis are not the same, blood purification is a big category, hemodialysis is a small category. Blood purification includes bedside hemofiltration, hemodialysis filtration, hemoperfusion, all of which are called blood purification. However, hemodialysis generally refers to the blood purification treatment done by ordinary low molecular, low flux dialyzer, which is called hemodialysis. Nowadays, the mode of hemodialysis includes the removal of intermediate molecules and even macromolecules, as well as bedside hemofiltration for resuscitation, and even a little bit more extended to include artificial liver, membrane lung, or ECMO, which are all treatments that are included in the scope of hemodialysis. Hemodialysis is the foundation of life-sustaining, nowadays the basic medical insurance mainly covers hemodialysis, on the basis of hemodialysis, to improve the quality of life, hope to live a better life, can be added hemoperfusion or hemofiltration, so as to remove intermediate molecule toxins and macromolecule toxins to ensure a better quality of life, can reduce more complications, can improve the quality of life, this is supposed to be the better and wider scope of purification modes. This should be a better and wider purification model.