Ultrasound examination of the kidney is relatively inexpensive and provides way to assess renal location, contour and size. Dupler ultrasonography is a noninvasive tool for screening of renal artery stenosis. It is not only provides kidney morphology data but also describes hemodinamic changes associated with renal artery stenosis, such as increased peak sytolic velocity (PSV) and dereased resistance index (RI). The aim of this prospective study was comparission of the duppler ultrasonography results of transplanted kidney between kidney donors before transplantation and kidney recipients 6-12 months after transplantation. We compared results of duppler ultrasonography in 20 kidney donors and recipients before and 6-12 months after transplantation. For this porpose kidney size and cortex thickness and echogenicity, anastomosis, mean pulsatility index(MPI), resistance index(RI) were recorded.Then statistical analysis was performed. There was more than 10 mm increase in transplanted kidney length after 6-12 months of transplantation in 75% of recipients.There was also more than 10 mm increase in anteroposterior diameter of transplanted kidney in 80% of recipients.There wasn’t any significant change in cortical thickness in our study. MPI increase in 55% and RI increase in 70% transplanted kidney There was less than 50% anastomosis stenosis in only 17% transplanted kidney. In coclusion, there was enlargement in size and increase in MPI & RI of transplanted kidney in our study. Anastomosis stenosis was also less significant in our study.