Yifeng County, belonging to Yichun City of Jiangxi Province, is located at the southern foot of the middle part of the Jiuling Mountains in northwest Jiangxi Province. Yifeng County is adjacent to Gao 'an City in the east, Shanggao County in the south, Wanzhi County in the west and Tonggu County in the northwest. North and Xiushui County, Fengxin County bordering, a total area of 1935 square kilometers. By the end of 2018, Yifeng County had 5 townships, 7 towns, 2 reclamation farms, 2 forest farms, 207 village committees and 1,797 villager groups. According to the seventh census, as of midnight on November 1, 2020, the permanent population of Yifeng County was 252,974.

Yifeng County was founded during the reign of Emperor Wu of The Three Kingdoms (222-229). The Caodong School and Linji School of the five Southern Chan Schools of Chinese Buddhism originated in the Dongshan and Huangberi Mountains within the territory. Tianbao Ancient Village in Yifeng is a famous village in Chinese history and culture. Yifeng has been named "Civilized County of Jiangxi Province" for three consecutive years, and won the title of "Nominated City of National Civilized City" in 2015. Yifeng County is a subtropical warm and humid climate zone, with an average annual temperature of 17.2 degrees Celsius. Yifeng County has a forest coverage rate of 71.9%, a woodland area of 2.038 million mu, a bamboo forest area of 840,000 mu, and a standing bamboo stock of 120 million, ranking the third in China and the first in the province. It is the hometown of bamboo in China.

In March 2019, Yifeng County was included in the List of Counties under the Protection and Utilization of Revolutionary Cultural Relics (the First Batch). In 2020, the GDP of Yifeng County was 15.455 billion yuan, an increase of 4%; Total revenue was 2.01 billion yuan, down 3.9%.
In November 2020, it was selected as the "sixth National Civilized City".