The history of Minjiang Tulou, the structure of Tulou and why Tulou disappeared.

Fujian Tulou originated in Song and Yuan Dynasties and matured in the late Ming and early Qing Dynasties and the Republic of China. The oldest and youngest world heritage earth buildings are located in Chuxi earth buildings. Qing Ji Tower with a diameter of 66 meters has a history of 600 years, while Shanqing Tower with a diameter of 3 1 meter has a history of only 30 years. The formation of Fujian Tulou is related to several famous Han immigrants from the Central Plains in history. During the Yongjia period of the Western Jin Dynasty, that is, in the 4th century, there were frequent wars and natural disasters in the north, and the local people moved southward on a large scale, which opened the prelude to the continuous migration of Han people from the Central Plains to Fujian for thousands of years. The immigrants from the Central Plains who entered southern Fujian merged with local residents, forming the Fulao nationality with Minnan dialect as its characteristic. The Han nationality in the Central Plains who migrated from Ganzhou, Jiangxi Province to the mountainous areas in western Fujian Province constitutes another important ethnic group in Fujian-the Hakka ethnic group characterized by Hakka dialect. Fujian Tulou was born in the Song and Yuan Dynasties. After the development in the middle and early Ming Dynasty, it gradually matured in the late Ming Dynasty, the Qing Dynasty and the Republic of China, and has continued to this day. Fujian tulou is a unique large-scale rammed earth residential building in mountainous areas in the world, and it is a creative masterpiece of adobe architecture. Fujian tulou is built on the mountain with reasonable layout. It absorbs the concept of "Feng Shui" in China's traditional architectural planning (see Dong Bin's Modern Feng Shui Mirror), adapts to the living and defense requirements of people living together, and skillfully uses the narrow flat land in the mountains and local raw soil, wood, pebbles and other building materials. It is a self-contained, economical, strong and defensive high-rise building type with great aesthetic feeling.