Tianhe was located in the first year of the Northern Zhou Dynasty (566) and governed Yizhen County (now the Northwest School of Banan and Maoxian in Sichuan Province). For the governance of yizhen county. The jurisdiction is probably in the northwest of Maoxian County, Sichuan Province and east of Heishui County.
The great cause of the Sui Dynasty was abolished in three years (607).
In the first year of Tang Wude (6 18), it was restored. Governing Zuofeng County (now near Selgu, southeast of Heishui County, Sichuan Province), moving to Yizhen County in six years (now north of northwest school yard of Maoxian County, Sichuan Province), moving to Sitang County of Xizhou in three years (now near Weicheng, northwest of Maoxian County, Sichuan Province), changing to Linyi County in the second year of Shangyuan (742), and restoring Yizhou in the first year of Gan Yuan (758). In the first year of Guangde (763), he entered Tubo.
In the fourth year of Jinxingding (1220), it was promoted to Yicheng County, which governs Yicheng County (now Shanxi). Its jurisdiction covers Yuanqu, Jiangxian and Yicheng counties in Shanxi Province. At the beginning of the Yuan Dynasty, it was still reduced to Yicheng County.