Objective:To investigate the predictive value of peripheral blood platelet-to-lymphocyte ratio(PLR)combined with modified trauma score(RTS)for 28-day prognosis in emergency trauma patients.Methods:The clinical data of 108 pa-tients with emergency trauma were retrospectively analyzed.According to the 28-day prognosis,the patients were divided into survival group(n=91)and death group(n=17).The general data and laboratory indexes such as white blood cell count and PLR were compared between the two groups.Logistic regression analysis was used to determine the risk factors of prognosis.The receiver operating characteristic(ROC)curve was used to evaluate the predictive value of related indicators for the 28-day prognosis of patients.Results:Compared with the survival group,the proportion of emergency mechanical ventilation in the death group was increased(P<0.05),the RTS score was decreased(P<0.05),and the injury severity score(ISS)was in-creased(P<0.05).Compared with the survival group,the platelet count and PLR in the death group decreased(P<0.05).There was no significant difference in other routine laboratory indexes between the two groups(P>0.05).Logistic regression analysis showed that emergency mechanical ventilation(OR=4.591),RTS score(OR=0.708)and PLR(OR=0.776)were independent factors affecting the 28-day prognosis of patients(P<0.05).ROC curve analysis showed that both PLR and RTS scores had certain predictive ability for 28-day death in emergency trauma patients,with AUC of 0.764 and 0.736,respectively.The AUC of the combination of the two was 0.822,which was higher than that of the single index(P<0.05).Conclusion:Pe-ripheral blood PLR and RTS scores are closely related to the 28-day prognosis of emergency trauma patients,and the combina-tion of the two can better predict the prognosis of patients.