During the present study, we evaluated the effect of renal artery emergence angle on branching pattern and renal artery length. During a cross-sectional study from August 2005 to May 2007, 104 patients underwent contrast–enhanced 64 MDCT renal angiography in Tabriz Imam Khomeini Hospital. The number of arteries, number of branches, presence of accessory artery, early branching, first RA branch origination from aorta (Delta-D) and emergent angle of renal artery from aorta in horizontal section (Delta-A) were assessed. 103 patients’ data analyzed with 65/37 male to female ratio. The mean of age was 31.42±16.96 years. The mean value of aorta diameter, angle of renal artery emergence in coronal section, renal artery diameter and distance to first branching were respectively, 1.55±0.25 cm, 56.43±15.28 degree, 0.61±0.11 cm and 3.39±1.54 cm. There was not significant difference between right and left kidney arteries diameter and distance (0.61±0.11 vs. 0.62±0.11, 3.54±1.82 vs. 3.25±1.18). There was not any correlation between angle of RA emergence and RA Delta-D and RA diameter. There was early branching in 34 arteries (16.7%). Also accessory artery was presented in 53 kidneys (26.3%) that 23.8% kidneys had single and reminder (2.5%) had double accessory artery. In evaluation of relations of RA DeltaD, diameter and DelatA with early branching and accessory artery presence, we could not find significant difference. In conclusion, angel of RA origination from aorta in horizontal section doesn’t affect RA distance to branching or diameter and also haven’t any role on early branching or accessory artery development.