Introduction to Rongchang Building: Rongchang Building is the most eye-catching round earth building among the earth buildings in Zhongchuan Village. It is a medium-to-small round earth building, three stories high, and the base of the walls is less than 1 meter made of granite. It consists of a Gate for entry and exit. Opposite the main door in the building is the atrium. There are 30 bays, a total of 90 rooms in the building. Each room is equally divided and is a typical axe-shaped room. Compared with ordinary round earth buildings, Rongchang Building has two major features. First, its floors are relatively high, and second, its rammed earth walls are of extremely high quality. It is the round earth building that pays the most attention to the quality of its earth walls among ancient earth buildings today.