Introduction to Jiujin Hall: Jiujin Hall is the core part of the entire Tusi City. It is also a rare wooden structure with pure mortise and tenon joints in China. The Jiujin Hall is 99.99 meters deep and 33 meters wide, with a total construction area of ​​3,999 square meters. It consists of 333 pillars, 333 stone pillar foundations, 330 doors, more than 90 windows, thousands of carved wooden windows, thousands of purlins, and ceilings. It is composed of thousands of rafters.