What blood is transfused in leukemia depends on the specific situation of the patient. If the leukemia patient has severe anemia, he needs to be transfused with red blood cell suspension; if the leukemia patient has severe reduction of platelets as the main clinical manifestation, he needs to be transfused with platelet support therapy; if the leukemia patient has abnormal coagulation function, he needs to be transfused with fresh frozen plasma or cold precipitation for treatment. The type of blood component that needs to be transfused for leukemia is determined on a case-by-case basis, but homozygous blood transfusion is required regardless of which component is transfused. Patients with leukemia need to be closely monitored throughout the treatment process for blood count and coagulation, and if necessary, transfusion of blood components to support the patient’s safety during the entire treatment process.