Dangchang County, under the Gansu Province Longnan City, is located in the south of Gansu Province, northwest of Longnan City, east and Li County border, west and Gannan Prefecture Zhouqu County, Dibei County neighboring, south and Wudu District adjacent to the north and Minxian, Dingxi City, connected. The county covers an area of 3,331 square kilometers, with 11 towns, 14 townships and 336 administrative villages under its jurisdiction. As of November 2020, the resident population of Dangchang County is 254,900 people. Dangchang County is located at the edge of the Qinghai-Tibetan Plateau and the intertwined zone of the two mountain branches of the West Qinling and Minshan Mountains, with an altitude of 1138-4154 meters above sea level, and an average annual temperature of 9.3℃, belonging to the temperate continental climate zone. Weiwu highway passes through Hadapu Town, Tanchang County, Tanchang County, two estuaries, Shawan Town. Lan Yu Railway runs through the whole territory of Dangchang County. In 2020, Dangchang County completed the gross regional product of 3.078 billion yuan, the completion of fixed asset investment of 1.385 billion yuan, large-caliber financial income of 280 million yuan, urban residents per capita disposable income of 25,600 yuan, rural residents per capita disposable income of 7666 yuan.