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　li＇gament　of　molar　when　tiled　angle　increases.