Qin ruled the internal history of the capital, and Han Wudi divided it into local internal history. In the first year of Emperor Wu of the Han Dynasty (BC 104), Zuo Neishi was renamed Zuo Fengyi, and was in power in Chang 'an (northeast of Jin 'an), which was equivalent to a county magistrate. The case of Hanshu is under the jurisdiction of 13 city, with 37,090 households, 145 195. Duty is equivalent to the county satrap, and the jurisdiction is equivalent to a county, which governs 24 counties. Today, the north of Weihe River, east of Jinghe River and the middle and lower reaches of Luohe River in Shaanxi Province are not called counties because the land belongs to Jifu and moved to Gaoling in the Eastern Han Dynasty (now southwest of Gaoling County). During the Wei Dynasty of the Three Kingdoms, the "Left" word was changed to Fengyi County, and the chief executive named Fengyi Taishou moved to Linjin (now Dali). During the period of Emperor Wu of Jin Dynasty (265-290), it was renamed Dali County. Since then, the place names have changed frequently, and the Western Wei Dynasty changed to Tongzhou. In the early years of Tang Tianbao (742), it was called Fengyi County, and in the third year of Gan Yuan (780), Tongzhou was restored.