Tancheng Tancheng County has a long history. At the end of the clan society, people had settled in the territory. At that time, it was the land of "Dongyi", the Tai family was the famous chief of Dongyi, and the Shao family was a branch of the Yellow Emperor family that developed eastward, called "Yan" land. The leader of Yan State in Zhou Feng was called Yan State here and later became Tan State. During the Spring and Autumn Period, Tan belonged to Lu, which is why "Tan Zi was against Lu" and "Confucius studied Tan Zi". During the Warring States period (about 4 14 BC), it was destroyed by the State of Yue. The Qin Dynasty established Tan County, later renamed Donghai County, and established Tan County, which belongs to Xuzhou Secretariat Department and is under the jurisdiction of the county, county and secretariat department. In the sixth year of the Tang Dynasty, Zhenguan withdrew from the county to Xiapi, and the Yuan Dynasty resumed. Originally named as "Tancheng" county, it was soon saved into Linyi. Tancheng County was restored at the end of Yuan Dynasty. After the Ming and Qing Dynasties, the county territory has changed, but the county name has not changed. After the founding of the People's Republic of China, it belonged to Linyi area.