【Abstract】 To discuss the influence of the enteral and parenteral nutrition with type 2 diabetic (T2DM) patients after gastrointestinal tumor surgery.Methods 86 postoperative gastrointestinal tumor patients complicated with type 2 diabetes mellitus（T2DM）were randomly divided into the enteral nutrition (EN）group and the parenteral nutrltion (PN) group, each group has 43 cases. EN group were given EN enternal nutrition. PN group were given PN. The blood glucose, nutritional index, recovery of gastrointestinal function and postoperative complication rate were contrasted between the two groups one week after surgery.Results Compared with preoperative, there was no significantly difference in FBG and 2 h PG in the EN group 1week after the operation(P＞005), but these in PN group were significantly higher than preoperative (P＜005). FBG and 2 h PG in the EN group were significantly lower than these in PN group 1 week after the operation (P＜001). The nutritional indicators, including BW, ALB, PA, TFN and Hb in the PN group after the operation significantly decreased were significantly lower than these in the EN group(P＜005). Anal exhaust time after the operation in the EN group was significantly shorter than that in the PN group(P＜001). The postoperative complication rate in the EN group was significantly lower than that in the PN group(P＜001).Conclusion The curative effect of EN on T2DM patients after gastrointestinal tumor surgery is better than that of PN. The recovery of gastrointestinal function is faster, and the incidence of postoperative complications is lower in the patients of EN group.