The　Da-Xiong　Palace　in　Si-Chuan　province　is　taken　as　an　example　to　study　the　damage　of　ancient　buildings　by　Wenchuan　earthquake.　Typical　damage　characters　of　the　structure　are　discussed　and　a　finite　element　model　is　built.　By　modal　analysis　basic　frequency　and　main　modes　of　structure　are　obtained.　By　dynamic　analysis　responses　of　displacement　and　stress　of　the　structure　are　obtained.　Results　show　that　the　main　reason　for　incline　of　columns　of　the　structure　is　that　tenon　pulled　from　mortise　of　some　tenon-moritse　joints　between　tie　beams　and　columns,　but　the　structure　will　not　be　destroyed　for　strength　failure　under　seismic　forces.