Tongyuan Gate Wall Site is a national key protected cultural relic Chongqing ancient city wall-Tongyuan Gate Section Gate and Wall. Its predecessor is Zhenxi Gate, and its base site is Jiangzhou City Wall built by Shu Du and Li Yan in the four years of the Three Kingdoms'construction (226 A.D.) and Peng Daya in the second year of Jiaxi in the Southern Song Dynasty (1238 A.D.) to fight against Mongolian iron riding. This time, because I lived in Qixing Gang, I found this cultural relic on my way to Jiefang Monument in the evening, because I didn't stay too much for maintenance. Tongyuan Gate is one of the two remaining city gates in Chongqing, and the city wall of Tongyuan Gate section is the only one with relatively complete preservation in Chongqing.