The Haihe River is the largest water system in northern China and one of the seven major rivers in China. The Haihe River system was collectively known as "Jiuhe" in ancient times. During the Song Dynasty, the dry current of Haihe River was the lower reaches of the Jiehe River. Jin and Yuan were renamed the Naoqi River and Daqi River. The name Haihe began to be seen at the end of the Ming Dynasty. It was not until the Qing Dynasty that the names such as Naoqi River were gradually replaced by the name Haihe.