Introduction to the Royal Road: A pedestrian walkway paved with a stone slab in the middle and gray bricks on both sides, running through the north and south, connects with the Royal Road of the Forbidden City and becomes the symbol of the south central axis. The floor paving and rest facilities are consistent with the style of the Temple of Heaven wall, using natural materials such as gray bricks and green tiles, integrating into the overall style of the south central axis of "flat, generous, simple and natural".