The purpose of this research is to analyze the formational process of traditional house in old village that is the base of development on rural area. The method of this research is to use the family genealogy of the clan society village in the analysis of building times, and constructed with investigation by the residents. The results of this research are described as follows. 1. At the first period of settlement in the middle time of 18C, the small relative family was located at nearby of each other. They were divided three group. The first entered man is B-group. 2. At the period of 19C, the family was enlarged by the descendants. But at that time, the house was constructed by small type. And some tiled roof houses were built by A-group part at under area of the village. And the construction of village boundary was nearly completed. 3. At the early period of 20C, the great houses were constructed by C-group part at the upper area of the village. 4. At the late period of 20C, there were not changed largely. But small change was occurred by the divided of site. Except two house, every houses were changed to tiled roof house. The residents have continued the strong preservation mind of environment for 300 years. The family genealogy was very useful to analyze the formational process of traditional house in the clan society village.