The stilt barn is a special functional building in the slate house settlements of the Rukai and Paiwan people. It is used unevenly among tribes. It can be understood that it is inherent in non-traditional culture and is borrowed from other cultural groups. However, its regional development also seems to reflect the strictness of the class system, and can be regarded as a "compensation mechanism" for cultural adjustment to balance the class system. The construction of dry-stall barns shows geographical characteristics, and there are two types of double-slope roofs and four-slope roofs with obvious geographical distribution. The double-slope roof may be a remnant of the lowland ethnic groups around Ailiao River in Pingtung that spread upstream along the river. It is related to the Northern Culture group of the Iron Age or the Dawulong people in the historical period. It was first spread to the Paiwan people and then through the Paiwan people. The Wan people spread to the Rukai people. The original source of the four-sloping people may be related to the Beinan culture in the late Paleolithic Age, and then spread indirectly to the Paiwan mountainous area through the Makadao people in the west. Although the origins of the two are different, they both have the phenomenon of "source disappearance" of architectural forms. That is, the dry-stall barn form was retained in the mountainous areas of the Rukai and Paiwan people due to the "cultural lag" phenomenon of relatively closed geographical environment. area, however, the original place of origin has evolved due to the architectural form and no specific form remains.