Abstract: Objective To establish the surgical blood order schedule （SBOS） and explore the influencing factors of blood transfusion for orthopedic surgery patients. Methods We retrospectively enrolled 2 930 patients undergoing elective orthopaedic surgery in our hospital from January 2018 to December 2019,collected the application and actual usage of red blood cells（RBCs）,and analyzed the patients' blood transfusion rate,per capita RBCs transfusion,and whether there is a risk of major bleeding according to the type of surgery,to formulate SBOS for elective orthopaedic surgery. We used chi-square and Logistic regression methods to analyze the transfusion information and screened out the factors affecting perioperative transfusion. Results （1）The amount of RBCs application was 5 256 U by 2 930 patients of 15 surgical categories. The amount of RBCs transfusion was 538 U by 142 cases,with transfusion rate 4.85% and the per capita transfused RBCs amount was（3.93±2.63）U. The SBOS was divide into 3 categories：free Typing/Antibody-Screening （T/A-S）,only T/A-S and T/A-S with Crossmatch. （2）Multivariate Logistic regression analysis showed that the patient's age, preoperative hemoglobin level, and multiple injuries had an effect on perioperative RBCs transfusion（OR=0.145,3.058, 5.683,all P<0.05）. Conclusion The establishment of SBOS in orthopedic surgery provides a basis for better guidance of clinical blood transfusion. At the same time,the preoperative hemoglobin level,multiple injuries and age should be fully considered.

Key words: Orthopedic surgery, Elective operation, Surgical blood order schedule, Blood transfusion