In this paper is introduced an image guided oral implant system (IGOIS), including the 3D surface-model generation through Marching Cubes algorithm and large-scale triangular mesh simplification, the realization of pre-operative planning module with computer graphics and image processing technology, the non-invasive point-to-point registration with the fabrication of tooth-supported polymer resin templates and ICP algorithm, and the development of the real-time navigation system software by programming in VTK and VC+ +6.0. The experimental test for a patient's rapid prototype model shows that with the support of IGOIS, the precision achieved in the planning phase can be transferred to the patient so that the accuracy of the oral implant surgery under difficult conditions is improved.