Zhengding, located in Shijiazhuang City, Hebei Province, is located in the plain of Suizhong, anciently known as Changshan, Zhending, and historically, Beijing and Baoding have been called "Northern Sanxiong Town". Zhengding City Wall was built in the 16th period of the East Jin Dynasty. North Zhou, Tang, Jinyuan period has been expanded and rebuilt to varying degrees, is now a relic of the Ming Dynasty. In 2013, the Zhengding City Wall was announced as a key cultural relics protection unit in the country.