Yinan is a county under the jurisdiction of Linyi City, Shandong Province. Located in the mountainous area of Luzhong, it is adjacent to Juxian County in the east, Mengyin in the west, downtown in the south and Yishui in the north. The county covers a total area of 1774 square kilometers, governs 16 townships, 980 administrative villages and has a population of 900,000. [1] There are "three high and one railway" (Beijing-Shanghai, Ridong, Shen Chang Expressway and jiaozhou-xinyi railway), two national highways and three provincial highways, with convenient transportation; It is 30 kilometers away from Linyi Airport and 80 kilometers away from Rizhao Port, with obvious location advantages.