154 patients with rectal cancer were divided into the main group and the control group. All of them were investigated using endorectal and intraoperative sonography, spiral computer tomography and magnetic resonance tomography. Basing on the data of radial diagnostics pelvis model with tumour projection into rectum, bladder, ureters, prostate, uterus and vagina was recieved in all patients from the main group using Power SHAPE programm. Application of modern radial techniques and 3D modeling in diagnostics of rectal cancer contributes to adequate extent of surgical treatment adjacent with increased amount of radical operations (from 50% to 81,5%) and improvement of prognosis and survival rate in postoperative period.