Hemofiltration works to remove excess water and toxins from the body for the purpose of blood purification. Hemofiltration, also known as blood filtration, is the process of passing blood through a filter in an extracorporeal circuit by means of a machine (pump) or the patient’s own blood pressure, which filters out a large amount of fluid and solutes under filtration pressure while replenishing electrolyte solutions similar in composition to plasma fluid. The effect is to remove excess water and toxins from the body for the purpose of blood purification. Hemofiltration is generally used for severe heart failure, uremia, severe water-electrolyte disorders, acid-base balance imbalance, acute pulmonary edema and other diseases. It should be noted that this treatment is not recommended for patients with cerebral hemorrhage, shock, or mental abnormalities. Hemofiltration should be carried out strictly under the guidance of doctors, and if there is any discomfort during the process, doctors should be informed and treated in time to avoid adverse consequences.