Because　the　connection　between　mortise　and　tenon　is　semi-rigid　deformation　behavior,　rather　than　full　rigid　or　ideally　pinned　connection,　it　is　a　key　to　accurately　approach　property　of　semi-rigid　stiffness　of　mortise　and　tenon　during　the　numerical　simulation.　This　study　summarizes　the　research　of　the　development　of　semi-rigid　element,　and　establishes　easy　computing　and　analytic　finite　element　model　of　mortise　and　tenon.　In　addition,　parameters　of　the　model　have　been　obtained　by　comparing　numerical　result　using　MSC　FEM　software　and　the　consequence　of　crossing　timber　frame　experiment　through　response　surface　method　and　optimize　interactive　theory.　The　analysis　and　the　result　mentioned　above　could　be　applied　on　the　study　of　other　entire　large-scale　ancient　wooden　architecture.