Yimen County, under the Yuxi City of Yunnan Province. It is located in the central and western part of Yunnan Province, northwest of Yuxi City, east to Anning City and Jining District, south to Eshan, west to Shuangbai across the Lujujiang River, north to Lufeng City and Anning City. It belongs to Yuxi City. The southeast is 146 kilometers away from Yuxi City organs resident Hongta District, the northeast is 94 kilometers away from the provincial capital Kunming, 43 kilometers of high-grade highway from the county can direct to Kunming, Chuxiong and other places. County east and west transverse distance 44 kilometers, north-south longitudinal distance 57 kilometers, a total area of 1571 square kilometers, the government resident Longquan Town. According to the seventh census, as of midnight on November 1, 2020, the permanent population of Yimen County was 151,671.

Yimen Longquan National Forest Park is a national forest park approved by the State Forestry Administration in 1992. In July 2020, the National Committee for the Protection of Health confirmed Yimen County as the National Health County in 2019.

In 2020, the GDP of Yimen County was 1.325161 million yuan, which was 6.0% lower than the previous year at comparable prices.