Abstract: 1) Advancement of CT machine: Since CT machine has been applied, with unceasing development of computer technique, detector technique, X-ray technique and new micro-electron and micro-technique have been used, thereby performance of computerized X-ray tomography machine has been improved greatly, it is era-changing identification of computerized X-ray tomography scan from bed plane scan to spiral scan. 2)The image after-treatment technique: With emergence of spiral computerized X-ray tomography and exploitation of computer software, this new kind of imaging method that means VE has been paid attention to widely that making up images of three dimension simulation endoscope bv means of guidance technique.