Subei Mongolian Autonomous County, an autonomous county under Jiuquan City, is located in the northwest of Gansu Province, on the north-south and north-south sides of the western end of the Hexi Corridor. The county is divided into two unconnected regions, namely, Nanshan and Beishan. The total area of the county is 66748 square kilometers, bordering on three counties and cities of one country and three provinces (regions). According to the data of the seventh population census, the permanent population of Subei Mongolian Autonomous County was 15093 as of 0:00 on November 1, 2020.

Subei County had nomadic activities in the pre-Qin period; In the Western Han Dynasty, it was incorporated into the territory of the Central Plains Dynasty and belonged to Dunhuang County; After the war, the ownership has changed frequently, the scope of influence of local governments and nomadic peoples is staggered, and the control of the central government is weak. Since the Qing Dynasty, it has been under the jurisdiction of Gansu Province. In the 25th year of the Republic of China (1937), Subei Bureau was established. It was liberated in July 1950, and Subei Mongolian Autonomous County was established in 1955.

The natural environment in the north and south of Subei County is very different. The average altitude of Qilian Mountain in the south of Nanshan District is more than 3500 meters, and the altitude of Tuanjie Peak is 5826.8 meters, which is the highest peak in Gansu Province; The piedmont is a sandy gobi inclined high plain area. The Beishan area is characterized by medium-low mountains and residual hills, and the Gobi is widely distributed. Tourist attractions include Danghe Canyon, Transparent Mengke Glacier, Yanchi Bay National Nature Reserve, Subei People's Park, Five Temple Grottoes, etc.

Subei County has 46.76 million mu of natural grassland, mainly raising cashmere goats, yaks, camels and other livestock, and a small amount of arable land; The resources of coal, gold, iron ore and non-ferrous metals are abundant, and the mining industry is the economic pillar of Subei County.

On January 22, 2020, it was named the National Garden County by the Ministry of Housing and Urban-Rural Development.

In 2021, Subei Mongolian Autonomous County will achieve a GDP of 1.98 billion yuan, up 9.1% year on year; According to the resident population, the per capita GDP is 130964 yuan. The per capita disposable income of urban residents was 44720.92 yuan, up 6.8%; The per capita disposable income of rural residents was 31689.94 yuan, up 9.7%.