Mortise-tenon　joints　in　actual　projects　are　usually　complicated　and　composed　of　various　patterns　in　actual　projects,　which　are　commonly　called　unitized　mortise-tenon　joints.　The　study　is　based　on　The　Wen　Su　Pavilion　in　Shenyang　Imperial　Palace,　with　one　of　the　important　unitized　mortise-tenon　joints　as　research　objects,　which　contains　several　different　kinds　of　tenons　and　can　influence　the　structures　dramatically.　The　pseudo-static　experiment　was　conducted　on　a　full-size　timber-joint　model　to　analyze　its　deformation　characteristics　and　failure　modes.　The　corresponding　moment-rotation　hysteresis　curve,　skeleton　curve,　characteristic　parameters　and　restoring　force　model　were　obtained.　The　results　show　that　the　models　with　mortise-tenon　joints　exhibit　excellent　deformation　behavior.　The　destruction　of　the　joint　is　due　to　the　separation　of　mortise　and　tenon.　The　hysteretic　hoops　are　Z-shaped,　which　indicates　the　properties　of　semi-rigid　connection　of　the　timber　mortise-tenon　joints.　The　restoring　force　model　built　up　can　provide　not　only　the　necessary　theoretical　basis　for　finite　element　analysis　of　Wen　Su　Pavilion　but　also　the　experimental　basis　for　further　protection　and　restoration　of　ancient　buildings　of　the　same　type.　©　2018,　Editorial　Board　of　Journal　of　Tianjin　University(Science　and　Technology).　All　right　reserved.