Mengyin County, under the jurisdiction of Linyi City of Shandong Province, is located in the central south of Shandong Province, the northwest of Linyi City, is located in the hinterland of Taiyi Mountains, Mengshan Yin; It is adjacent to Yishui and Yinan County in the east, Xintai City in the west, Fei County and Pingyi County in the south along Mengshan Mountain, and Yiyuan County in the north. According to the seventh census, as of midnight on November 1, 2020, the permanent population of Mengyin County was 485,252.

Mengyin County in the early Western Han Dynasty, because of the Yin in Mengshan named, under the Yanzhou Taishan County. At the end of the Western Jin Dynasty, the county was abandoned due to the war. In the second year of Emperor Qing (1313), Mengyin County was rebuilt. In August 1953, the Linyi area. In December 1994, Linyi city was set up, still belongs to Linyi City. Mengyin County has been named as the second batch of "clear water and green mountains are gold and silver Mountains" practice and innovation base [1-2], the second batch of national agricultural product quality safety county, the second batch of water-saving society construction standard county (district), national garden county, etc.

In 2021, the GDP of Mengyin County reached 19.587 billion yuan, an increase of 7.8%; Revenue in the general public budget is 1.14 billion yuan, up 7.1%; The investment in fixed assets was 8.77 billion yuan, up 12.1%; Total retail sales of consumer goods reached 7.92 billion yuan, up 16.2%; The per capita disposable income was 28,808 yuan, up 9.3%