Objective To investigate the application of multi-detector row spiral CT （MDCT） and multi-planer reconstruction （MPR） in identify the anatomy detail of normal adult groin region. Methods We retrospectively collected the CT images of 50 adult subjects with normal groin anatomic structure underwent groin region thin-slice MDCT scans between July and December 2009, 30 males and 20 females, obtained the coronal and sagittal views by MPR, investigated the value of different plans in identifying anatomic detail. Results Bilateral inferior epigastric artery (100/100, 100%), spermatic cord (60/60, 100%), and round ligament of uterus (40/40, 100%) were well identified on all plans in all subjects. The bilateral “radiological femoral triangle” could be demonstrated on coronal views in all subjects (100/100, 100%). The bilateral inguinal ligament were visible on coronal view in all subjects (100/100, 100%) and on sagittal views in 34 subjects (68/100, 68%), but on axial views was identified in 3 male subjects (6/100, 6%). The bilateral inguinal canal and deep inguinal ring were reliably visible on coronal views in all subjects (100/100, 100%), and on sagittal views in 46 subjects (92/100, 92%). On coronal views, the widths of inguinal canal was (0.97±0.35) cm in left, (0.89±0.23) cm in right for males, and (0.62±0.11) cm in left, (0.71±0.11) cm in right for females. No significant difference was found between two sides (P=0.059 in males， P=0.067 in females), but there were significant differences between males and females (P=0.007 in left， P=0.009 in right). Transverse diameter of deep inguinal ring was (1.32±0.31) cm in left, (1.31±0.36) cm in right for males, and (1.07±0.35) cm in left, (1.07±0.30) cm in right for females. No significant difference was found between two sides (P=0.344 in males， P=0.638 in females), but there were significant differences between males and females (P=0.001 in left， P=0.002 in right). Conclusion MDCT with different plans plays an important role in identify the anatomic details of groin region, the coronal views especially.