Qin Zhidao was an important military road for Qin Shihuang to be supervised by Meng Tian from 212 BC to 210 BC. Qinzhidao starts from Yunyang Linguang Palace in the Xianyang military site, and goes to Jiuyuan County in the north. Qinzhidao passes through Ordos City, three Banners and one district, the Qinzhidao site protection unit is established in Ordos City. One of the northern border counties of the Han Dynasty, the Sufang County was set up in the Western Han Dynasty. In 127 BC (Yuanshou two years), Emperor Wu sent Wei Qing and Li Xi to send troops to attack the Xiongnu. Soldiers from Yunzhong County, west of Gaochun, and then westward to Fuli (now northern Gansu), regained the Hetao. The jurisdiction of the original Qin Dynasty (commonly known as "New Qinzhong"), and the Sufang County in the south of the Yin Mountain, has been identified in the northwestern part of the current Otog Banner.