The enormous carpenter technology document which became the accumulation of Doctor Akira Naito studying a modern building document systematically was analyzed exhaustively as a member of the research group. The thing that the diagram of the tradition building system which moves "joint" to the center was studied by the modern interpretation. The mutual relationship of the technology and the design is being argued with introducing the essence of the technology that the tree which made the wooden building style of proud Japan in the world possible is put together.