Abstract: This paper conducts a three-dimensional finite element analysis of stress distribution of the periodontical ligament as abutment tilts. Comparing with surface solid modeling method, mesh modeling technology is applied to reconstruction of fixed partial denture and periodontal tissues. Through this method, comparability of model with really biologic model has been proved and models of different tilted angles can be easily derived from the model constructed first. To investigate the stress distribution of periodontical ligament on different tilted angle of abutments by using three-dimensional finite element method, four team of models are constructed when tiled abutments is 0 degree, 12 degrees, 18 degrees, 24 degrees and 30 degrees separately. Meanwhile three types of occlusal forces are loaded respectively and the following conclusions were drawn: 1 ) Varieties of tilted angle in the same loadcase have small influence on stress distribution of non-tiled pre-molar; 2) For tiled molar, stress value of periodontical ligament is the biggest when the tiled angle is 24°; 3) Stress concentration is more remarkable on periodontical ligament of molar when tiled angle increases.