Objectives To determine the influence of total parenteral nutrition(TPN)and partial parenteral nutrition(PPN)on gut hormones in preterm infant.Methods The levels of gastin,motilin and vasoaetive intestinal polypoptide of 31 TPN and 33 PPN preterm infants were measured by RIA at ages of 1,3,7,and 10 days.Results On 7th and 10th day,three gut hormones were all significantly higher in preterm infant of PPN than those in preterm infant of TPN(P