In the early years of Qin and Han Dynasties (from 22 1 year to 206 BC), Quanzhou and Yongnu counties were established. Quanzhou County Site, located 500 meters north of South Shang Cheng Village in Yangcun Town, is now a cultural relic protection unit in Tianjin. The scope of Yongnu County is generally in the vast area east of the present canal, north of Bohai Bay, south of Xianghe and Baodi County. Yongnu county is located in the east of Miyagi village in the future. In a seawater immersion, people left the empty city, hence the name "Big Empty City". Later generations found it indecent and changed its name to Miyagi.
In the seventh year of Taiping Zhenjun in the Northern Wei Dynasty (AD 446), he withdrew from quanzhou county and merged into Yongnu County. At this time, Yongnu County has moved to the old county village of Jinsidian Town, and there is still a county site in the south of the village called "Sifang Taizi". The ancients said: the north of water is yang, and the south of water is yin. Yongnu County is in the north of Yongnu osawa, so it is called "Yongyang".
In the first year of Tianbao in the Tang Dynasty (AD 742), Yongnv County was renamed Wuqing County.