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Purpose: To evaluate the date and distribution of stress in periodontal membrane of the threedimensional(3-D)finite element model of different rate of clinical crown-root and width of marginal alveolar bone of maxillary central incisor.Methods: Reconstruct a 3-D parametric model of maxillary central incisor by reverse engineering software Geomagic,Mimics,and computer aid design program UG6.Then the 3-D parametric model was imported to Ansys Workbench software.Apply a force about 120N on the edge1/3 of the tooth 45°tilted,set up 3-D finite element model and evaluate the date and distribution of stress in periodontal membrane and alveolar bone of different rate of clinical crown-root and width of marginal alveolar bone of maxillary central incisor.