This paper reports our research project on the seismic performance of traditional wooden frames with large-section beams. First, based on past cyclic loading tests on four frames, a simple analysis model of a fitting-type joint was constructed using beam elements. Next, past experimental results were simulated by the model. Finally, a sensitivity analysis was performed to study about the effect of height arrangement of beams on the performance of the whole frame. The major findings of this study are as follows: (a) Some material tests are conducted for wooden test pieces cut down from all column of specimens. The compressive spring properties are decided. (b) Analysis models are constructed, and the restoring forces of frame specimens are simulated precisely. (c) The relation between height arranging beams and the change in restoring force is considered by sensitivity analysis.