The measurement of color Doppler sonography indices such as resistive index (RI), pulsatility index (PI), and systolic acceleration time can help the evaluation of transplanted kidney. The aim of this study was to determine the correlation between Doppler sonography indices and demographic and paraclinical findings in transplanted kidney. A cross-sectional study was performed on 47 (27 male and 20 female) unrelated living renal transplanted patients. The mean age, BMI, duration of transplantation, pulse pressure index (PPI) were 38.6±13 years, 25.06±4.5, 48.6±31 months and 0.34±0.06, respectively. There were a significant negative correlation between duration of transplantation and RI of interarenal artery (r=-0.38 p<0.01), PI of arcuate artery (r=-0.4, P<0.01) and PI of main artery (r=-0.34, p=0.019) respectively. There was a significant correlation between the age of patients and RI of interarenal artery (r=0.30, P=0.039). There weren’t any significant correlation between RI and PI of interarenal and main arteries and BMI, Cyclosporine level, serum creatinine and PPI, sex, sex of donor and episode of rejection. The mean RI of interarenal artery was significantly higher in diabetes (0.76±0.02 v 0.68±0.06, P=0.048). The mean of acceleration time was significantly higher in patients treated by Azathioprine versus Cellcept (52.12±16.7 v 35.4±9.6 m.sec, P=0.026). Perfusion of allograft kidney doesn’t decrease in few years after transplantation and older age and history of diabetes decrease the perfusion of allograft kidney.