Objective To explore the effects of autologous blood transfusion on coagulation function,in-flammatory factors and immune function in patients with traumatic brain injury.Methods 85 patients taken autologous blood transfusion were selected as the observation group,30 cases with allogeneic blood transfusion were taken as control group.The blood transfusion volume,perioperative hematocrit,prothrombin time and postoperative complications were observed and compared between the two groups.Results In the observation group,the total amount of autologous blood transfusion in the observation group was 36 338mL,averaged (427.5 ± 28.3)mL,the total amount of allogeneic blood transfusion was 8 747 mL,averaged (102.9 ± 12.7) mL,and the autologous blood accounted for 80.6% of the total transfusion.61 patients only transfused autolo-gous blood,accounting for 71.8%.In the control group,the total allogeneic blood transfusion volume was 15 918 mL,averaged (530.6 ± 22.8)mL,the consumption of banked blood in the observation group was signifi-cantly less than that in the control group (P< 0.05).The levels of platelet (PLT) and plasma fibrinogen (FIB)in the control group increased significantly at 3 d after operation compared with those before operation (P<0.05);while activated partial thromboplastin time (APTT) began to decrease significantly at 3 d after operation (P<0.05);the prothrombin time (PT) and thrombin time (TT)decreased significantly at 7 d after operation(P<0.05),and the level of PLT and FIB in the observation group began to increase significantly at 1 d after operation (P<0.05).PT,APTT and TT were significantly reduced 1 d after operation.Compared with the control group,the level of PLT and FIB in each phase of the observation group was significantly high-er than that of the control group (P<0.05),and the PT,APTT and TT were significantly lower than those in the control group (P<0.05).After operation,the level of pro-inflammatory factors in the observation group was significantly lower than that of the control group.The level of anti inflammatory factors and immune function were significantly higher than that of the control group (P<0.05),and the incidence of complications in the observation group was 2.4%(2/85),which was significantly lower than 16.7%(5/30)of the control group,and the difference was statistically significant (P<0.05).Conclusion Autologous blood transfusion has the advantages of rapidness,timeliness and safety in the operation for patients with brain trauma.It is helpful to save blood,reduce the effect of trauma and blood transfusion on blood coagulation function and im-mune function,and reduce the risk of blood transfusion complications and postoperative infection,which is worth of clinical application.