Eight years. 20 15 From February 8th, 15, due to institutional reform, Hejin Science and Technology Bureau and Hejin Education Bureau merged into Hejin Education Science and Technology Bureau, which lasted for 8 years until March 23rd, 2023. Hejin City is a county-level city under the jurisdiction of Shanxi Province and managed by Yuncheng City. It is located in the southwest of Shanxi Province and the northwest corner of Yuncheng City, with an area of 593 square kilometers.