Linkou County, subordinate to Mudanjiang City, Heilongjiang Province, is located in the eastern part of Heilongjiang Province, 120 kilometers away from Mudanjiang City and less than 100 kilometers away from the coal cities of Qitaihe and Jixi. It is the hub connecting the three cities. It is the frontier hinterland of Suifenhe, Dongning, Mishan, Hulin and other trade ports to Russia. It covers an area of 6688 square kilometers. According to the seventh census, as of midnight on November 1, 2020, the permanent population of Linkou county was 238,193.

Linkou County was inhabited as early as 6000 years ago. It was called Sushen before the Han Dynasty, and it was under the jurisdiction of Heishui Governor's Mansion in the early Tang Dynasty. Established in 1939, it is a national first-class old revolutionary base area county. There are famous at home and abroad where the heroic story of "Eight women throwing themselves into the River" took place and the site of the Northeast Resistance League. It is the hometown of Chinese calligraphy and Chinese folk art. Calligraphy, comic strip, oil painting, ice and snow painting, silkworm wing embroidery are well known throughout the country.

In 2020, the GDP of Linkou County reached 705.796 million yuan, an increase of 0.6 percent over the previous year based on comparable prices. The added value of the primary industry was 3011.188 million yuan, up by 3.0% over the previous year; The added value of the secondary industry was 652.33 million yuan, up by 5.0 percent over the previous year; The value added of the tertiary industry was 3.393.75 million yuan, down 2.1% from the previous year. The tertiary industrial structure is 43:9:48.