Cangzhou, the core city around Bohai Sea.

Qingzhou was the land of Yan, Qi, Jin and Zhao during the Spring and Autumn Period and the Warring States Period. Qin belongs to Julu County and Luobei County, and Han belongs to Jizhou and Youzhou.

The Three Kingdoms belong to Wei, and the Northern and Southern Dynasties belong to Yingzhou and Jizhou of Northern Wei. In the second year of Xiping, Emperor Xiaoming of the Northern Wei Dynasty (AD 5 17), Cangzhou was established, which governed Fuyang, Leling and Ande counties. Fuyang County was abandoned at the beginning of Sui Dynasty, and later belonged to Hejian County, Bohai County and Pingyuan County.

In the Tang Dynasty (AD 627), Zhenguan Yuan belonged to Hebei Road. In the first year of Tianbao (AD 742), Cangzhou was changed to Jingcheng County, which governed Qingchi County (now southeast of Cangzhou City, Hebei Province). Its jurisdiction is equivalent to the south of Haihe River in Tianjin, to the east of Jinghai County, Qingxian County and Botou City in Hebei Province, and to the north of Dongguang County and Ningjin, Leling and Wudi counties in Shandong Province. In the first year of Gan Yuan (758), it was changed to Cangzhou.