Tongan County, also known as "Silver City". Analysis of Jin Taikang's Three Years (282) Jian 'an County was located in Jin 'an County, Dong 'an County was changed to Jin 'an County, which governed Quanzhou, Xiamen, Zhangzhou and Putian. The county is now located in Fengzhou Town, Nan 'an, Quanzhou City. In the 19th year of Tang Zhenyuan (803), Datong Field was established in Nan 'an County, and in the 4th year of Tianfu in the later Jin Dynasty (939), Datong Field was promoted to Tongan County, which belonged to Quanzhou Prefecture. Tongan County 1958 belongs to Xiamen, 1970 belongs to Jinjiang and 1973 belongs to Xiamen. The implementation of county governance, because the county is silver ingot-shaped, so it is called "silver city." Historically, it has governed Jinmen and Xiamen, as well as parts of Jimei and Longhai. After liberation, the administrative region changed several times, and 1973 was placed under the jurisdiction of Xiamen. It used to be the only county under the jurisdiction of Xiamen Special Economic Zone, located in the center of Xiamen-Zhangzhou-Quanzhou triangle open area, and it was one of the early open counties along the coast of China. 1997 May 0 1 Tongan county is divided into districts.