This paper reports the results of study to develop potentialities of polycarbonate as structural materials for fitting type joint of traditional wooden structures. Major findings from the research are as follows: (1) Replaced wooden cotter pin with tusk tenon by polycarbonate, restoring force of joint had nearly equal as that with wooden cotter pin, and cotter pin was hardly breakage. (2) Replaced wooden oblique nuki by polycarbonate, nuki didn’t break and shear force of frame was higher than that with wooden oblique nuki in large deformation. (3) It had high reproducibility in analysis, because of heterogeneous and no anisotropic material.
