【Objective】 To establish the catalog of maximum surgical blood order schedule(MSBOS) for cesarean sections with different obstetric complications, so as to guide the doctors of clinical and Blood Transfusion Department to prepare blood reasonably. 【Methods】 The blood transfusion data during cesarean sections from January to October 2021 in our hospital were collected via medical record information system and blood bank system.The blood recipients were classified according to the main obstetric complications. The incidence of blood transfusion, per capita RBC transfusion units, blood transfusion index (TI) and other indicators were calculated, the literature and the risk of massive hemorrhage were referred, and the actual situation of Obstetrics Department was considered to formulate the obstetric MSBOS of our own. 【Results】 1) The blood recipients during cesarean sections were mainly diagnosed as placental abruption, placental implantation, central placenta previa and severe preeclampsia; the incidence of blood transfusion of them was 17.9%(20/112), 17.7%(15/85), 16.8% (27/161)and 5.2%(9/173), respectively, and TI indexes was 0.9, 1.3, 1.0 and 0.3, respectively. 2) The MSBOS of Obstetrics Department in our hospital had been established, and the blood preparation for obstetric surgery was divided into three categories: T(blood typing)/S(antibody screening), T(blood typing)/S(antibody screening)/C(crossmatch) 2 U, and T/S/C 4 U. 【Conclusion】 The establishment of MSBOS in Obstetrics Department of our hospital provides references for preparing blood reasonably.