In general, hemodialysis, hemoperfusion, and hemofiltration are similar in that they introduce human blood outside the body, but the difference is that after being introduced outside the body, they go through different dialyzers and dialysis methods to form different dialysis modes. Hemodialysis is the most common and most common, and patients do most of it by diffusing human blood into the machine with the dialysis membrane, and toxins are transferred from the high concentration to the low concentration, this process is called ordinary hemodialysis, and usually removes small molecules of water-soluble toxins. Hemoperfusion is the process of removing protein-bound toxins from the body through adsorption by adding an additional adsorption tank to the dialyzer after introduction into the body, depending on the patient’s condition and the toxins. The dialyzer used for hemofiltration is a hemofilter, which removes toxins with the removal of water, and the mechanism of action is diffusion. It removes mainly medium and large molecules of toxins.