The building is a stringed instrument of the ancient Chinese Han nationality. It is shaped like a qin. It was 5 strings in the pre-Qin period and later developed to 13 strings. There are columns under the strings.

When playing, the left hand presses one end of the string, and the right hand holds the bamboo ruler to strike the string to pronounce. Originated in the Chu region, its voice is mournful and agitated, and it was widely circulated in the pre-Qin period.