The Chuodun site, the village of Zhengyi Chuodun, Jiangsu province, contains relics of the Majiabang, Songze, Liangzhu, and Maqiao cultures on a 400,000-square-meter piece of ground, with a central area of 290,000 sq m.

It has numerous historical sites from the Tang and Song dynasties, which were excavated in Jan 1961 by the Nanjing Museum during an archaeological exploration of the Taihu Lake area. From July 30 to Aug 7, 1982, the Nanjing Museum did further research on the area, with assistance of the Kunshan Culture Center.

From 1998-2004, the Nanjing Museum, Suzhou Museum, and Kunshan Cultural Relics Management Center did more exploration of six archaeological sites, excavating a 3,393-sq-m area and discovering 450 remains from the Neolithic Period to the Tang and Song, including old houses, tombs, ash pits, wells, paddy fields, ditches, canals, and 1,000 utensils.

Because the Chuodun site is a well-preserved and important prehistoric relic site, the State Administration of Cultural Heritage named it a major archaeological discovery for 2000.