Introduction to Ningyuan Exhibition Hall: The Zhiyuan Tower is built on the extension of the central axis of the Flower Exhibition Hall. Corridors are built on the four sides of the tower, which together with the Flower Exhibition Hall form a rectangular courtyard. The tower is built in the middle of the courtyard. There is a hanging flower door in the east, west and north of the corridor as the entrance and exit. Flowers and trees are widely planted in the courtyard, and the verandah can also be used as an exhibition gallery.