The city site of Zhangyibao is located in Zhangyibao Village, Zhangyi Township, Liangzhou District, Wuwei City. It is a medium-sized ancient earth city. There are big cities and small cities. The big city is an irregular rectangle, with a length of 328 from east to west and a width of 300 meters from north to south, covering an area of about 98,400 square meters. The wall was smashed. Residual height is 3-7.3m, top width is 0.5-2.5m, rammed layer thickness is 0.10.12m, and corner piers are built on all sides. There is a moat 10 meters wide outside the city. Open the east and west doors, there is an urn outside the door, and the urn door faces south. There is a small town in the northwest of the big city, which is rectangular in plane, with a length of 250 from east to west and a width of120m from north to south. Now the city wall has been leveled, and the surface is scattered with gray pottery pieces and broken bricks. Small towns are the ruins of the Han dynasty, and big cities should be built for the use of the ruins of the Han dynasty and belong to the ruins of the Ming dynasty. The well-preserved city site is of great value to the study of urban construction history and Wuwei Han and Ming history.