This paper revealed the characteristics of the development of the building system of Japanese wooden houses from 1966 to 1976, from the survey of 416 evaluation records of wooden house structures by the Building Center of Japan. The results are as follows. First, the building system diversified around 1970 such as platform construction or log construction, in addition, some wooden panel building systems were mass-produced. Second, many building systems can be regarded as a rationalization of the conventional wooden building system, as the parts around the panels remained as posts and beams.
