Introduction to the canal: In 486 BC, King Wu Fucha dug the Hangou to connect the Yangtze River and the Huaihe River, and connected it with the Huaihe River at Hexia (then called Mokou) in the north of Huai'an City to facilitate the transportation of troops and grain to the north. . From then on, the place became increasingly prosperous. In the Qing Dynasty, the imperial court sent a special salt transport envoy to be stationed under the Huai'an River to take charge of salt administration and patrol the salt fields. It became an important commercial port in Huai'an.