Abstract: <b<Objective</b< To inquire into the technique of three dimensional (3D) reconstruction in spiral CT for urological diseases. <b<Methods</b< Retrospectively reviewed 54 cases successively underwent 3D reconstruction, in which contrast CT was performed in 46 cases by power or manual peripheral injection and received 50-100ml contrast media each. The examinatoin was performed on PQ 6000 spiral scanner and 3D reconstruction were obtained from voxel Q workstation. The scan parameters, timing of enhancement, pattern of 3D reconstruction, methods and skills in reconstruction were reviewed and analysed on by one. <b<Results</b< the scan parameters, dosage, form, timing of enhancement CT varies with different purposes. To learn the skills of reconstruction by a process of trial and find shaded surface display(SSD) and volume rendering (VR) technique showing vividly malformation, mass and stone of kidney. VR was more soft and SSD revealed strong stereoscopic effects. Maximum intensity projection (MIP) was very useful in CT urography and stenosis of renal artery. <b<Conclusions</b< To set a sensible scanning plan, mate properly scanning parameter and determine optimal timing of scanning plan, mate properly scanning parameter and determine optimal timing of scanning are all the important prerequisites for high quality 3D reconstruction in urological diseases. To grasp skillfully method and skill of 3D reconstruction is also a indispensable factor.