There is "traditional" cave architecture called " Yao-Dong" in China's Loess Plateau. The perspective of this paper is to discuss the cultural and social environment of Yao-Dong, which is related to that of Yao-Dongfs surroundings. And the purpose of this paper is to clarify the physical character of Yao-Dong, that is the approach for this perspective. In conclusion, Yao-Dong has the position of superior "refined" cave architecture. According to the criterion of "primitive"・"refined", that can be seen in the several classification of Yao-Dong, compound classification of Yao-Dong also can be done.
