Objective To explore the effect of early supplemental parenteral nutrition on the outcomes of critically ill patients.Methods Totally 302 patients admitted in the intensive care unit (ICU) of Taizhou Hospital of Zhejiang Province from 2015 to March 2017 were enrolled and divided into two groups:the enteral nutrition group and the supplemental parenteral nutrition group.The clinical data of the two groups were retrospectively analyzed and the outcomes was compared between the two groups.Results The time of ICU stay,mechanical ventilation days,nosocomial infections in ICU and the rate of feeding intolerance were significantly lower in the supplemental parenteral nutrition group than in the enteral nutrition group (P＜0.05).There was no statistically significant difference in the mortality rate in 28 days between the two groups.Conclusion Supplemental parenteral nutrition has many advantages like reduce the duration of ventilation,ICU stay and the rate of feeding intolerance,and it does not affect the 28-day mortality rate of critically ill patients with NRS2002 score＞5,or increase the complication of infection.