Introduction to the foundation site of Huimeng Platform: Located 80 meters outside the east wall of the Qicheng site, it is a rammed earth platform with a height of 4.6 meters, a length of 20 meters, and a width of 16 meters. It is the same period as the early city wall of the Qicheng site. build. According to historical records, from 626 BC to 531 BC, princes or officials from various countries held seven alliances here.