In　order　to　study　damage　of　ancient　buildings　by　the　Wenchuan　earthquake　in　China　on　12th　,may　2008,　we　took　Da-Xiong　Palace　which　is　189　km　far　away　from　the　epicenter　as　an　example　for　analysis.　Columns　of　the　palace　inclined　very　much　by　the　earthquake.We　used　time-history　method　to　simulate　response　of　the　palace　to　find　out　the　main　reason　for　the　large　inclination.　According　to　characters　of　tenon-mortise　joints　we　built　simulation　model　of　the　structure.Then　we　amplituded　Wenchuan　earthquake　waves　according　to　damage　intensity　of　the　palace.　By　dynamic　analysis　we　studied　responses　of　displacement　and　stress　of　the　structure　and　obtained　effective　data.Results　show　that　the　main　reason　for　incline　of　columns　of　the　structure　is　that　tenon　pulled　from　mortise　of　some　tenon-mortise　joints　between　tie　beams　and　columns,　but　the　structure　will　not　be　destroyed　for　strength　failure　under　seismic　forces.　©　2009　IEEE.