During the reign of Renzong in the Northern Song Dynasty, Minhe River and Caihe River, which had been linked together, were called Huimin River. When it comes to the origin of this name, we have to talk about Bao Zheng, a famous minister in the history of China. Legend has it that one year there was a big flood, a heavy rain, and the river overflowed, which flooded the streets and many houses in Kaifeng City, causing a large number of people to be homeless. Bao Zheng, who was in Kaifeng at that time, learned the reason of the cut-off through field investigation. Originally, due to the commercial prosperity and beautiful scenery on both sides of the Cai He River, many dignitaries regarded it as a treasure trove of geomantic omen, so they privately occupied the river and built water gardens and pavilions on the river for their own enjoyment. These "illegal buildings" at that time seriously blocked the river and affected the drainage capacity of the Cai He River. Bao Zheng immediately ordered the demolition of all dams and water buildings, and argued in front of Emperor Injong, eventually dredging the river and returning the government to the people. Because Bao Zheng was not afraid of powerful people and benefited the people, the people renamed Cai He "Huimin River" in order to thank him for his kindness.