Longchuan, called "Mengwan" in Dai, means the place where the sun shines. It belongs to Dehong Prefecture, Yunnan Province, and is located in the southwest border of China. It is connected with Myanmar by mountains and rivers and paths. The county covers an area of 1873 square kilometers, with a forest coverage rate of 63.98% and a border line of 50.899 kilometers. Zhangfeng, the county seat, is 779 kilometers away from Kunming, the provincial capital, and is the forefront of the southwestern border of China. According to the data of the seventh population census, as of 0:00 on November 1, 2020, the permanent population of Longchuan County was 181364.

Longchuan County has jurisdiction over 8 townships, 4 towns and 1 state-owned farm. The ethnic minorities in Longchuan County mainly include Jingpo, Dai, Achang, Lisu, Deang and Hui. It is the county with the largest population distribution of Jingpo and Achang in China. Longchuan is a typical frontier multi-ethnic agricultural county, with the greatest advantage of low land development cost, suitable for the development of green industrial economy and the port location advantage of developing foreign trade economy.

In 2020, Longchuan County's GDP reached 7.283 billion yuan, an increase of 11.3%, ranking first in the prefecture. According to industrial structure, the primary industry was 2.373 billion yuan, up 5.7%; The secondary industry was 1.472 billion yuan, up 24.5%; The tertiary industry was 3.438 billion yuan, up 9.3%.