The commanding height of the Grand Canal is Wang Nan, which is known as the "water ridge" of Jining. In order to cross the "water ridge", people "set up a sluice weir in Yanzhou to make Surabaya flow westward; Tugangcheng vertical sluice weir divides water into Guanghe River, and reaches Jeju (Xinhe River) in the south with six sluice gates to stop the water (The First Bend of Yuan Dynasty). The problem of water diversion has been basically solved. In July 26, the Huitong River, the waterway leading from Jeju River to Linqing, was dug, and the Beijing-Hangzhou Grand Canal was opened. The South-to-North Water Transfer Project was successful. In order to solve the two major problems of siltation and water shortage in the Yellow River, people have taken measures such as "avoiding the Yellow River to ensure transportation" and adding "water tanks" to ensure smooth transportation. Here, special mention should be made to the Wang Nan Water Diversion Project.

"In the ninth year of Yongle (14 1 1), the Ming court allowed Tongzhi Pan Shuzheng in Jining to play an invitation, and ordered Song Li, the minister of the Ministry of Industry, to lead165,000 soldiers and civilians to serve" (Wenshang County Records). Song Li's first problems are smooth rivers and insufficient water resources. Song Li is knowledgeable. He traveled incognito, and in the sunshine of Caishan, Juntun Township, Wenshang, he met an old farmer Bai Ying who was nearly half a century old. Bai Ying is a respected "old man" in the countryside. Feeling Song Li's sincerity, he put forward the plan in his mind. Bai Ying pointed out that the Yellow River is silted, the river course is vicissitudes, and the terrain changes. It is not enough for the Yuan Dynasty to bring literature and department into the economy, so it is necessary to find another way. Yang Wen's land potential is high in the northeast and low in the southwest, which leads the water from Yang Wen directly to the top of Wangnanling, and then sets up gates to divide water in the north and south of Wang Nan. This is the "boating on the water" plan, which is abbreviated as "boating on the water". This is a clever and bold idea. Song Li won the treasure and asked Bai Ying to direct the construction together. They built a dam in Daicun at the junction of Wenshang and Dongping, crossing "five miles and thirteen steps" (actually 423 meters), forcing Wenshui to flow into He Xiaowen and Wang Nan in the south. A movable fishmouth-shaped "stone fish" was chiseled at the water diversion point to control the north-south water diversion. The so-called "seven points for the emperor and three points for the south" (actually measured as six points for the south and four points for the north). Creatively transform lakes such as Wang Nan, Anshan, Machang and Zhaoyang into "water tanks" that can be stored freely. In Yanzhou, Qingzhou, Jeju and other places, 300 springs were dug, and the five-vein water system was used to supplement the canal water source, which fundamentally conquered the Wangnan water ridge and ensured the unimpeded canal for many years. In the history of canal development in China for more than 2,300 years, the Wang Nan water diversion project, like the Dujiangyan project of Li Bing and his son in Sichuan, is a world-class water conservancy concept.