Abstract: The visualization and real-time tracking technologies of the probe in surgical navigation system are studied.The electromagnetic positioning method is introduced,and the probe with data acquisition function is designed based on electromagnetic positioning.Firstly,the probe model is constructed by means of three-dimensional solid modeling technology, and the transformation from the solid geometry model to the three-dimensional surface models is completed.Secondly,the probe tip is registered using the pivot calibration method and the registration accuracy is also tested.Then,the registration between the CT model and the patients site is realized intraoperatively by means of iterative closest point(ICP) algorithm, and simulation analysis and accuracy verification are carried out.Finally,according to the preoperatively registered position and orientation,the spatial location of the probe is tracked in real-time and accurately,and is displayed in the system.The results show that the data acquisition function and registration accuracy of the probe,as well as the effect of registration algorithms can meet the needs for surgical navigation.