Objective:To explore the application effect of standardized nursing model based on evidence-based concept in high-flow humidified oxygen therapy(HFNC)for emergency elderly patients with pneumonia.Methods:A total of 160 elderly patients with pneumonia were selected as the study subjects.The patients were divided into control group(n=80)and observation group(n=80)according to different nursing methods.The control group was given HFNC nursing with routine nursing mode,and the observation group was given HFNC nursing with standardized nursing mode based on evidence-based concept.Both groups were intervened for 7 d.The differences of arterial blood gas indexes[arterial partial pressure of oxygen(PaO2),arterial partial pressure of carbon dioxide(PaCO2)],respiration,heart rate,oxygen saturation(SpO2),time of symptom improvement[normal body temperature time,lung moist rale weakening time,sputum thinning time and shortness of breath disappearance time]and adverse reactions were compared between the two groups.Results:After intervention,PaO2 and SpO2 increased in both groups(P＜0.05),and the observation group was higher(P＜0.05).PaCO2,respiration and heart rate decreased in both groups(P＜0.05),and the observation group was lower(P＜0.05).The normal temperature time,lung moist rale weakening time,sputum thinning time and shortness of breath disappearance time in the observation group were shorter than those in the control group(P＜0.05).The incidence of adverse reactions in the observation group was lower than that in the control group(P＜0.05).Conclusion:In emergency elderly patients with pneumonia HFNC,the standard-ized nursing model based on evidence-based concept can improve the blood gas index of patients,correct the symptoms of hypoxia,and promote the improvement of clinical symptoms and reduce the occurrence of adverse reactions of oxygen therapy.