I have only been here. Most of the southern mountain areas in Weinan are in the north. The north side needs to be explored. The earth building is not completed. It was formerly the barracks, castles and cottage buildings when the Tang Dynasty opened the Sheng Wang Chen Yuanguang opened the army. It is a product of the special social environment in Weinan Mountains. Zhangzhou Tulou walls are made of raw soil as the main material, mixed with lime, fine sand, glutinous rice, brown sugar, bamboo chips, wood strips, etc., and are repeatedly crushed and built. The whole earth building is made of in-place materials, basically soil, sand, stone as the main frame, wooden pillar support, with wooden partitions, surrounded by open land with streams of pebbles paved aisles, open fields, drainage ditches, the most common. The form is more, long square, round, octagonal, Taiji, connecting buildings, multi-storey rings ~~~~