Abstract: Objective: To explore the application effects of 5 level national triage system(5L NTS) in emergency internal medicine in a First-class hospital at Grade 3.Methods: The patients were randomly divided into the experimental group and control group,which were classified using 5 level national triage system and traditional standard triage,respectively.The triage failure rate,waiting time and satisfaction of patient in two groups were observed.Results: The triage failure rates of the experimental group and control group were 1.0% and 9.2%,respectively,the difference of which was statistically significant(P< 0.05).The average waiting time of the experimental group and control group were(7.44±7.00) min and(10.12±9.44) min,respectively,the difference of which was statistically significant(P< 0.05).The satisfaction during waiting,overall hospital medical service satisfaction and physician service satisfaction in experimental group were significantly higher than those in control group(P< 0.05 to P< 0.01).Conclusions: Five level national triage system can effectively reduce the nurse triage failure rate and incidence of adverse event,shorten the waiting time of patient,and improve the patients' satisfaction.