Or the culture of Xi people, an ancient minority, still remains in these hypotheses. The most influential one is the theory of Xi people, that is, Guyaju Caves caves were thatched cottages where Xi people lived in the northern mountainous area of Yanqing during the Tang and Five Dynasties. Qichang Zhao, former director of the Academic Committee of the Capital Museum, and other experts hold this view. Qichang Zhao's comprehensive exposition of Guyaju Caves Grottoes in Yanqing, Beijing —— Also on Xixi Site. Yanqing has been a traffic artery and a battleground for military strategists since ancient times. Donggou, where Guyaju Caves Grottoes are located, is located in Zhang Jiaying Town, Yanqing District, which is the part where the remaining veins of Dujun Mountain "extend" to the plain. Westerners, an ancient northern minority in China, are a branch of Xianbei nationality in Donghu. According to historical records, Xi people are good at making cars, which are called "Xi cars" in historical records. Xiren originally lived in the northeast of China. At the end of the Tang Dynasty, one branch migrated to the west and was called Xixi, while the one that stayed in the same place was called Dongxi. Today, Guanting Reservoir and the northern mountainous area of Yanqing belong to Guizhou, and Guyaju Caves Grottoes are in this area, which is consistent with the ground view. According to Qichang Zhao's research, the residents of caves in Guyaju Caves probably lived in caves for more than 30 years. It can be seen that Xi people have not lived here for a long time. In just over 30 years, it is doubtful whether Xi people have enough time and manpower to dig such a large space of cliff-dwelling buildings. Bi Deguang, Ph.D., Renmin University of China, specializes in archaeological research of northern nationalities. In Textual Research on the Historical and Cultural Heritage of Xi People, he thinks that the Guyaju Caves Grottoes in Yanqing are the important cultural heritage of Xi people (Xixi people), and according to the time and place, he speculates that "Guyaju Caves Grottoes are the dwellings dug by Xixi people after they moved to Guizhou". According to another introduction, there are sporadic cliff-dwelling relics in the surrounding mountainous areas, and the scale is very small. Only Guyaju Caves Grottoes in Donggou are the largest and best preserved grottoes in northern China. Relevant data of ancient cliff settlement sites with unique value show that Guyaju Caves Grottoes are very hidden. However, after on-the-spot investigation, the reporter found that although it is remote, it is not particularly secret. Geographically, this is the valley mouth where the plain has just entered the mountainous area, not the deep mountain. Standing on the cliff outside the cave, you can see the plain outside the cave and the roof of the village on the plain, and the Guanting Reservoir in the distance is also clearly visible. So in ancient times, it should not be difficult for people in plain areas to find this huge cliff settlement. In this regard, this is not an ideal refuge. Yang Hongxun, an architectural archaeologist and researcher at the Institute of Archaeology, Chinese Academy of Social Sciences, dated the Guyaju Caves Cave in Han Dynasty, believing that it was an accessory building of the Great Wall built by the troops guarding the border at that time. Examination of Guyaju Caves Grottoes is a preliminary achievement of our investigation and study of Guyaju Caves Grottoes, which was just published in February 201kloc-0/65438. Wang Yun, executive deputy director of Peking University Architectural Research Center, told reporters. Wang Yun and others inspected the Guyaju Caves Grottoes from the perspective of architectural settlement research, and the team he led was called the settlement research group. In Wang Yun's view, settlement is to observe a village as a whole and the living conditions of the residents in the settlement as a whole. As an ancient settlement, Guyaju Caves Grottoes are special in many aspects and have unique values. It should also be compared with some cliff houses at home and abroad (such as Turkey and Fujian). Regarding the settlement nature of caves in Guyaju Caves, Wang Yun said that more analysis and discussion are needed to draw a conclusion. In fact, there is no need to jump to conclusions about the cultural phenomenon like Guyaju Caves Grottoes. First of all, it is feasible to conduct detailed research in the fields of history, archaeology and architecture. In a word, in order to uncover the mystery of Guyaju Caves Grottoes, a unique architectural cultural heritage, it needs in-depth research in academic circles.