The objective of this study is to clarify the spacial formation of the traditional dwellings of the DAI RYAM in Yunnan, China. The results are following. 1) The spacial division exists along with the span by which their act of living is parted. 2) The concept of the spacial seating protocol of Upper - Lower and Innermost - Nearest to the Doorway have a large influence on the living in their dwellings and the spacial composition. 3) The abovementioned concept of Upper - Lower is regulated by the sunken. 4) The concept of the area of Indoor - Outdoor exists in the space and the areal composition has grading according to 5 ranks.