Half Autumn Water Pond is built on the canal below the mountain behind Laifeng Pavilion, which is on the water's surface, so it is named. Half Autumn Water Pond used to be a pavilion in the shape of a half-moon, also known as the moon pavilion. Built in the 17th year of the Republic of China (1928), it was reconstructed into a mountain-like building facing north with a rectangular shape, a width of 13.5 meters, a depth of 4.8 meters, a total height of 4 meters, and a building area of 67 square meters. The building faces the mountain on the south and faces the water on the other three sides. There is also a half-round pool in front.