Introduction to the Holy Fire Platform: It is located on Longzhu Mountain south of the Shennong Hall, opposite the Yongfeng Terrace across the Sacrificial Avenue. The platform is 40 meters high, with three floors in the shape of a pagoda. Each floor is 0.6 meters high. It is a trapezoidal round platform with diameters of 9 meters, 6 meters and 3 meters respectively. The bottom layer is paved with granite slabs and is protected by square granite railings with a side length of 100 meters. Meter means the sky is round and the earth is round. In the center of the platform stands a 3.9-meter-high brown-red flint stone with a volume of 31 cubic meters. The front is engraved with a 1.5-meter-high vermilion pictographic character "Yan", which looks like a burning torch.