Introduction to Yigan Pavilion: Liubei Pavilion in the middle of the palace courtyard is a square wooden structure with four corners and pointed roofs. The pavilion is paved with white marble, and water flows from a white marble faucet on the east side of the pavilion. It flows out from the mouth, enters the pavilion from the east side along the diversion stone trough, and after several twists, flows out from the west side.