The largest and well-preserved walled city of the Longshan culture in the Central Plains was excavated by Henan Provincial Institute of Cultural Relics and Archaeology at Guchengzhai site,Xinmi city during the years of 1997-2000.Being square,the walled city occupies 160,000 square meters in total,with the high rammed earth walls of the south,north and east,while the west wall has been partially washed away by the Qin river passing through the west side.Large-scaled palace-like foundation and many features have been found and the Longshan cultural remains can be divided into four phases,the palace-like foundation and the rammed earth walls belong to the second phase,or the middle Longshan phase.It is believed that the materials from Guchengzhai are of importance in understanding the studies of the origin of civilization in central China
