Abstract: Objective:To investigate the value of modified early warning score(MEWS) and patient at risk score(PARS) in evaluating the prognosis of emergency patients.Methods:The general clinical data,which included gender,age,respiratory rate,heart rate,blood pressure(systolic blood pressure),blood oxygen saturation,temperature(axillary temperature),level of consciousness and lasting 4 hours urine volume,in 2 931 emergency patients were retrospectively analyzed.At 0,2 and 24 h of admission,the patients were evaluated using MEWS and PARS,and the area under curve(AUC) of ROC of prognosis predicted by MEWS and PARS were compared at different time-points.Results:At 0,2 and 24 h of admission,the AUC of ROC of prognosis predicted by PARS was 0.936,0.950 and 0.827,respectively,the AUC of ROC of prognosis predicted by MEWS was 0.915,0.932 and 0.825,respectively,and the differences of AUC at all time-points were not statistically significant(P>0.05).According to the MEWS and PARS scores after 2 weeks of admission,the mortality rate in patients with MEWS ≥ 4.5(11.04%) was higher than that in patients with MEWS <4.5(6.30%)(P<0.05),and the mortality in patients with PARS ≥ 4.5(12.73%) was significantly higher than that in patients with PARS <4.5(6.19%)(P<0.01).Conclusions:The MEWS and PARS have good evaluation value in the prognosis of emergency patients.The MEWS has little parameter,is simple,quick and efficient,and can be evaluated at admission.