Abstract: Objective:To evaluate retroperitoneal parasitic foetus of MSCT axial images and image post- processing performance,further improve the understanding of the disease inspection method.Methods:2 cases of clinical suspected diagnosis of retroperitoneal parasitic foetus with MSCT scan first,then the original image to AW workstation 4.2 a thin layer of multiplanar reconstruction(MPR),volume representation(VR) and maximum density projection(MIP);Observation of axial,MPR,VR,MIP imaging characteristics.Results:2 cases of axis of probably have shown in the image to see a mixed density with irregular shape,clear boundary,which see liquid,fat,bone,soft tissue density with post processing image in the spine,pelvis,and part of limbs.Conclusion:MSCT post-processing techniques of retroperitoneal parasitic has high diagnostic value,especially VR can directly provide parasitic foetus imaging characteristic.