In 2021,the Research Center for Chinese Frontier Archaeology,Jilin University and others conducted excavation at the Xiaoheishan site in Jianping County,Liaoning,and uncovered a small,hilltop,moated settlement dating to the mid-late Lower Xiajiadian culture.Discovered features include houses,midden pits and ditches,along with artifacts made of pottery,stone,bone,antler,and tusk.The main part of the settlement has been revealed,and various functions of midden pits have been identified.Amongst them,three types of special midden pits were distinguished:pits filled with stone blocks used for artifact manufacturing or construction materials;pits containing collapse dwelling debris mainly composed of red burnt adobe;and pits with many deliberately broken and buried pottery sherds,likely representing sacrificial pits.This excavation has provided significant data for further understanding the cultural characteristics of early Bronze Age regional societies in the Jianping to Lingyuan area.It has also enriched our knowledge of the distribution and layout of Lower Xiajiadian culture settlements.