Jiayin County, affiliated to Yichun City, Heilongjiang Province, is located in the north of Yichun City, the right bank of the middle Heilongjiang, the eastern part of the northern foot of the Lesser Khingan Mountains. It is located between 48°8 '30 "and 49°26' 5" north and 129°9 '45 "and 130°50" east. The total area is 6739 square kilometers. Jiayin County borders Luobei County to the southeast, Hegang City to the south, Fenglin County and Tangwang County of Yichun to the southwest, and Xunke County to the west. The jurisdiction of Jiayin County is a narrow section from the northwest to the southeast. As the Lesser Khingan Mountains run through the whole territory from the southwest, the northern foot extends to the Heilongjiang bank like a chicken's foot, so the terrain is high in the southwest and low in the northeast. Jiayin County belongs to the north of the temperate continental monsoon climate zone, and the climate varies greatly throughout the year. As of 2018, Jiayin County has jurisdiction over 4 towns and 5 townships. County government in Chaoyang Town. According to the seventh census, the permanent population of Jiayin County was 56,523 as of midnight on November 1, 2020.

Five years of the Republic of China (1916), set up a black cloud, under the Heihe road Yin office. In 1970, it belongs to Yichun City. Jiayin County has been awarded the titles of "National Garden County", "National Health County" and "National Civilized County". There are dinosaur national geopark, Maolangou National Forest Park and other scenic spots.
In 2019, the GDP of Jiayin County reached 2.46 billion yuan, with a year-on-year growth of 5.7%; The investment in fixed assets was 830 million yuan, up 19.9% year on year; Retail sales of consumer goods totaled 720 million yuan, up 7.1% year on year; The budgetary revenue of public finance reached 108 million yuan, up 8.1% year on year; The per capita disposable income of urban and rural permanent residents reached 24,824 yuan and 18,307 yuan, up 6.1 percent and 9.9 percent year-on-year.