Kang County is subordinate to Longnan City, Gansu Province, and is located in the southeast of Gansu Province, the southeast of Longnan City, and the junction of Gansu, Sichuan and Shaanxi provinces. Kangxian County was formerly known as Kangzhou in ancient times. In the Northern Zhou Dynasty, Kangzhou was purchased, and later abolished and incorporated into Wuzhou (rank state). Kangxian County was established in 1929. Kang County has 18 towns and 3 townships under its jurisdiction, with a total area of 2967.95 square kilometers. According to the data of the seventh population census, as of 0:00 on November 1, 2020, the permanent population of Kang County was 162418.

Kang County is located in the Longnan Mountain on the south side of the West Qinling Mountains, with an altitude of 560-2483 meters. It belongs to the transition zone from subtropical to warm temperate zone, with abundant rainfall, humid climate, sufficient light, and a forest coverage rate of 66.7%. It is known as "Longshang Jiangnan" and "Longshang Xishuangbanna". The natural resources of Kangxian County include water resources, biological resources, mineral resources, etc., with a total output value of 1.922 billion yuan in 2015.

Kang County is "the home of organic tea in China", "the home of walnut in China", "the home of black fungus in China", and "the home of edible fungi in China". The famous specialties include Longshen tea, walnut, edible fungi represented by Kang County black fungus, etc. In addition, Kang County is also a "famous green county in China", "the best ecological and livable tourism destination in China", and "the most beautiful green eco-tourism county in China". There are Yangba Subtropical Ecotourism Scenic Spot, Huaqiao Village, Baiyun Mountain Forest Park and other scenic spots.

In February 2020, Kangxian County was approved to quit after being approved by the leading group of poverty alleviation in Gansu Province.

On June 4, 2021, Kang County was included in the list of pilot counties for water system connectivity and water beauty rural construction in 2021.

In 2020, Kang County achieved a gross domestic product of 2338.77 million yuan, an increase of 2.1% over the previous year. Among them, the added value of the primary industry was 43.107 million yuan, an increase of 4.9% over the previous year; The added value of the secondary industry was 343.18 million yuan, down 2.9% from the previous year; The added value of the tertiary industry was 1564.52 million yuan, an increase of 2.7% over the previous year. The ratio of the three industrial structures is 18.43:14.67:66.9.