At present, the main research on the wood structure of ancient building is quasi static test, and the dynamic test of mortise joint is few. In order to study the dynamic characteristics of mortise joint under different test conditions, according to the municipal engineering practice rules a mortise joint model with a scale of 1∶5.3 was produced , and through long-term cyclic loading test, the variation of mortise joint model Fang top displacement in the excitation process, variation of Stubbs mortise, top displacement and pull Fang tenon quantity relationship were studied. Experimental results show that the displacement of nodes increases with the increase of the loading amplitude and decreases with the increase of loading frequency. Node displacement is also increasing as the number of cycles increases gradually and finally tends to be stable, indicating the start node residual deformation is large, and the cumulative displacement is of fast development. The displacement of the top node Fang has a linear correlation with the tenon pulling-out amount . At the same time, when the loading frequency is fixed, the displacement of the node can be unified, finally, the corresponding displacement parameters are obtained by fitting the exponential function. The results of the study can provide a reference for the stability of the existing traditional wood structure tenon joints.