Tangjing is located on the south side of the street of Jiucheng Palace. It is close to the main building complex in the palace. It is an important drinking well in the palace. The well is round and engraved with exquisitely patterned octagonal sunflowers. One is beautiful and the other is non-slip. There is a circular slope between the inside and outside. The entire well platform is built with fine texture of light green hemp stone, the surface of the well platform is slightly spherical convex surface, high and low inside, prevent turbid water backflow, to ensure drinking water hygiene.