Delayed graft function(DGF) may occur during early post – transplant period. In this paper, we present our findings regarding delayed graft function (DGF) after pediatric renal transplantation and its predictive variables.From 1985 to 2004, a total of 300 pediatric renal transplantations were performed at our institution of test, 10 cases with DGF and 50 controls who were operatored by the same surgers were enrolled in this study. The mean (range) age of the recipients and donors was 11.4 (3-15) years and 28.05 (20 - 50) years, respectively. All kidneys were retrieved from living donors. We compared patients with DGF with other pediatric recipients regarding four independent variables: age difference between donors and recipients, serum hemoglobin difference between donors and recipients, mean blood pressure difference between donors and recipients, weight difference between donors and recipients. One year, two years and three years graft survival rates were 91%, 89%, and 75%, respectively.The differences between donors and recipients regarding weight and mean blood pressure in subjects with DGF were not higher than other patients (42Kg vs. 37.4Kg, p=0.4; -3 mm Hg vs. -4.1mmHg, p=0.8). The differences between donors and recipients regarding weight and mean blood pressure are not predictor variables for DGF.