Because there is a promising city in Wanquan County. Wanquan Youwei City is located in wanquan town, Wanquan County, Zhangjiakou City, Hebei Province. Founded in the 26th year of Hongwu in Ming Dynasty (1393), it has a history of more than 600 years. Known as the first guardian of Jingxi and a living fossil made by Wei Ming Research Institute. It is an important part of the defense system of the Great Wall in Ming Dynasty, and is considered as one of the best-preserved military fortresses in Hebei and even North China. Wanquanyouwei city covers an area of about 2.68 square kilometers. Wanquan Youwei City was originally planned and built according to the needs of the entire Great Wall defense system. The city wall is the functional area of the city defense, and the city is a simple and clear cross street. The functional zoning of the city is bounded by east and west streets, north and south streets, and the northwest is a cultural and educational area. The southwest area is the administrative office area. The southeast is a storage area. The northeast is a residential area.