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This study explains and demonstrates how to construct the 3-D finite element model of dentofacial complex with the original DICOM data of CT, for the analysis of their biomechanical characters.The establishment of 3-D finite element model of maxillary complex: spiral CT scanned, then CT workstation outputted CT images in DICOM format to personal computer, using ANSYS and Mimics software established the 3-D finite element model of maxillary complex of human being.