PURPOSE: A method for generating image matching data for an orthognathic surgery, and a method for an orthognathic simulation surgery using the same are provided to guarantee the exact shapes of teeth by removing virtual and accidental images on a CT image.CONSTITUTION: The noise in a CT image for the facial bone of a patient is removed. An anatomical part is restored, and converted into an image file. The teeth shapes of the patient are scanned in three dimensions. The scan data is revised and analyzed. The converted image file is brought up. The important part of a masticating surface is set. The scan date matches with the image coordinate system of the image file. The revised scan data is overlapped in the converted image file. The tooth image in the image file is removed. The three-dimensional image about the facial bones is obtained(S100). A first simulation surgery which moves the lower jaw in the image file is performed(s200). A second simulation surgery about an additional surgery is performed(S300). The data for manufacturing surgical equipment is provided(S400).COPYRIGHT KIPO 2013[Reference numerals] (S100) Step of converting a CT image of the facial bone of a subject patient to create an image file, removing a tooth image from the created image file, and combining a tooth image obtained by three-dimensionally scanning a tooth model of the subject patient in a predetermined biting condition, thereby obtaining a three-dimensional image of subject patients jaw joint (S200) Step of performing a first simulation surgery which brings the tooth image and moves the lower joint in the image file to correspond to an image file of lower jaw teeth located in a biting position relative to the upper jaw in the image file with reference to upper and lower tooth images in the biting condition (S300) Step of determining whether to perform an additional surgery the upper and lower jaws in the biting condition and performing a second simulation surgery for the additional su
