Chengtoushan Ancient Culture Site, located in Lixian County, Changde City, Hunan Province, is the site of prehistoric Daxi culture to Shijiahe culture in southern China, and the only ancient city site with the earliest discovery age, the richest cultural relics and the most complete protection in China, and is known as "the earliest city in China". 12 1979 During the general survey of cultural relics in Hunan Province, archaeologists in Lixian County discovered Chengtoushan site for the first time. From 199 1 to 20 1 1, under the auspices of Hunan Institute of Archaeology, Lixian County carried out 13 archaeological excavations, covering an area of nearly 9,000 square meters, and unearthed a large number of precious cultural relics such as ancient city ruins, clan tombs, large altars and paddy fields with complete irrigation facilities. Chengtoushan ancient cultural site represents the development height of Neolithic ancient civilization in the Yangtze River valley, which is of great significance to the study of the origin of human civilization, the establishment of early cities and the emergence of classes and countries. 1996, Chengtoushan ancient cultural site was approved as a national key cultural relics protection unit; 200 1 year, it was named as one of the "New Archaeological Discoveries of China 100 in the 20th century" and was engraved on the bronze aisle of "China Millennium Monument".