In clinical practice, there are many kinds of diseases that require blood transfusion, among which hematologic diseases often require blood transfusion therapy. Common diseases requiring blood transfusion include: a. Aplastic anemia, especially heavy aplastic anemia, due to the patient’s hematopoietic failure, a series of symptoms such as severe anemia, thrombocytopenia, infection, etc., requiring blood transfusion therapy, transfusion of red blood cells to improve anemia symptoms, and platelet transfusion to improve bleeding symptoms. Second, leukemia, leukemia patients after chemotherapy, serious bone marrow suppression, the patient will also have serious infections, bleeding, anemia and other complications, need to actively transfuse blood treatment, through the transfusion of red blood cells to improve the symptoms of anemia, platelet transfusion to improve the number of platelets, transfusion of plasma to improve the patient’s immunity. Third, various coagulation disorders. Especially hemophilia a and hemophilia b. These diseases have decreased coagulation factor activity in the body and often require plasma transfusion and cold precipitation infusion therapy. Fourth, patients with thalassemia major, which requires long-term transfusion of red blood cells. In addition, other systemic diseases, such as ruptured ectopic pregnancy bleeding, gastrointestinal hemorrhage, etc., often require blood transfusion therapy.