Abstract: 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.