Excavators not only found proto-porcelain vessels, pots, bowls and millstones in the tombs, but also many precious bronze pieces such as spears, swords, scythes and bells.

"Two bronze artifacts are quite unique. One is a spear with very fine decoration, different from those in Central China. The other is a sword, which is relatively large for that time," Chen said.

The ruins of Dushan are located on the half-slope of Yunhe's Xiaxiaoqiao village and form the shape of a letter "L". This location is of great significance for transportation, especially external exchanges in ancient times.

The archaeologist said exploration in Yunhe has gradually illustrated the history of the Western Han Dynasty (206 BC-AD 24), Western and Eastern Jin dynasties (226-420) as well as the Tang (618-907), Song (960-1279), Ming (1368-1644) and Qing (1644-1911) dynasties.