Yongji is a county-level city under the jurisdiction of Yuncheng City in Shanxi Province. It is located in the southwest of Shanxi Province with a total area of 1208 square kilometers. Yongji City jurisdiction 3 streets, 7 towns, the city government in the west street. According to the seventh census data, as of midnight on November 1, 2020, the permanent population of Yongji was 394,935.

Qing Yongzheng six years (1728) up Puzhou for the house, Yongji County, belongs to Puzhou House. On January 12, 1994, with the approval of The State Council, Yongji was set up as a city. The South Tongpu Railway runs through the east and west, and connects with the Longhai Line across the Yellow River. The Daxi high-speed Railway has a station in Yongji, and the Yunfeng Expressway runs through the whole territory. Yongji City has stork Tower, Wulao Peak, Pujiu Temple and other scenic spots. On October 22, 2018, Yongji City was selected into the list of pilot areas for the integrated development of primary, secondary and tertiary industries in the country in 2018. On March 6, 2019, Yongji City was selected into the list of counties under the protection and utilization of revolutionary cultural relics (the first batch).

In 2017, the total output value of Yongji was 13.16 billion yuan, calculated at comparable prices, with an increase of 7.0% over the previous year. From the point of view of industry, the added value of the primary industry completed 2.23 billion yuan, with a year-on-year growth of 3.5%; The added value of the secondary industry was 5.79 billion yuan, up by 8.0% year on year; The added value of the tertiary industry completed 5.15 billion yuan, with a year-on-year growth of 7.0%. The proportion of the tertiary industry was 16.9:44.0:39.1. The per capita GDP was 28,578 yuan. In 2019, China's GDP reached 12.69 billion yuan, an increase of 2.3 percent.