Ryan has a long history. In the late Neolithic period, human ancestors flourished on both sides of Feiyun River. It belonged to Yangzhou in ancient times. During the Spring and Autumn Period and the Warring States Period, it was first Vietnamese territory, and then Chu State. After the Qin State merged with the six countries, counties were set up, which belonged to Minzhong County first and then Huiji County. In the second year of Wu Chiwu in the Three Kingdoms (239), Sun Quan set up Luoyang County in the south of Yongning, which was the beginning of the establishment of Rui 'an County. Originally known as Luoyang, it has been more than 1750 years, and later changed to Anyang and Angu. At the end of the Tang Dynasty, Zhao lived in Jiyunge, the northern suburb of the county, in the third year (903). It was said that he was lucky, so he changed his name to Rui 'an. The Yuan Dynasty was promoted to a state in Zhenyuan. In the third year of Hongwu in Ming Dynasty (1370), it was reduced to a county. In Qing Dynasty, Ruian belonged to Wenzhou and Zhejiang Province. Ruian county people's government was established 1949. 1In April 1987, the county was withdrawn to set up a city.1In April 1998, it was listed as a coastal economic open zone in the State Council.