Yiyuan County, affiliated to Zibo City of Shandong Province, is located in the middle of Shandong Province. It borders Linqu County of Weifang City to the east, Yishui County to the southeast, Laiwu District and Gangcheng District of Jinan City to the west, Xintai City of Tai 'an City to the southwest, Mengyin County of Linyi City to the south, and Boshan District and Zichuan District to the north, with a total area of 1636 square kilometers. In 2021, the registered population of Yiyuan County is 572,400. As of October 2021, Yiyuan County has jurisdiction over 2 subdistricts and 10 towns, and the county government is located at 61 Zhenxing Road.

Yiyuan County is a revolutionary old base area, enjoying the policy support of Yimeng Revolutionary Old Base Area. It is the birthplace of ancient mankind in Shandong Province, the national all-region tourism Demonstration area, the advantageous area of agricultural products with Chinese characteristics, the national civilized County, the national key ecological functional area, the National Sustainable development Experimental area, the county division of revolutionary cultural relics protection and utilization, and the national demonstration area of the quality and safety of exported food and agricultural products.

In 2021, the GDP of Yiyuan County was 31.55 billion yuan, an increase of 12.1% over the previous year. The added value of the primary industry was 4.33 billion yuan, and that of the secondary industry was 13.08 billion yuan; The added value of tertiary industry was 14.14 billion yuan, and the proportion of tertiary industry was 13.72:41.46:44.82.