Objective:The volume of massive blood loss of the patient who carries out ECC in cardiac surgery is correlated obviously with postoperative complications,re-operation and mortality.In this study,we reviewed the volume of blood transfusion around ECC of the adult patients in our hospital that carried out cardiac surgeries,and analyzed the correlation factors of the massive blood loss during ECC.Methods:The adult patients carried out ECC aided cardiac surgery during 2001 ~2006 in our hospital were selected.