It is confirmed that the real existence of Xia Dynasty is Erlitou site in western Henan. According to the calculation of 14 C, a considerable number of palaces, ancestral temples, roads and drainage systems were indeed established from 3900 to 3600 years ago, just before the Shang Dynasty. Its bronze casting technology has made great progress compared with the culture of earlier years, and it began to cast ding, Jue and other ritual vessels, which is consistent with the historical records of casting ding in Xia Dynasty.