During the period of Yang Di (Yang Guang), it is said that in order to see the Qionghua in Yangzhou and transport the grain from the south to the north, Yang Di dug a canal from the Jinghuai section to the south of the Yangtze River, with a total length of more than 2,000 kilometers. In the Yuan Dynasty, most of the capital of the Yuan Dynasty (now Beijing) had to dig canals to transport grain from the south to the north. For this reason, three sections of rivers have been dug successively, and the horizontal canal of the Sui Dynasty with Luoyang as the center has been built into a vertical grand canal with Dadu as the center and Hangzhou as the south. The Beijing-Hangzhou Grand Canal is divided into seven sections according to its geographical location: from Beijing to Tongzhou District, it is called Tonghui River, which is 82 kilometers long; Tongzhou District to Tianjin is called the North Canal, which is 186 km long. Tianjin to Linqing is called the South Canal, which is 400 kilometers long. Linqing to Taierzhuang is called Lu Canal, which is about 500 kilometers long. Taierzhuang to Huaiyin is called the Central Canal, with a total length of 186 km. Huaiyin to Guazhou is called the Li Canal, which is about180km long. Zhenjiang to Hangzhou is called Jiangnan Canal, which is about 330 kilometers long. Yangzhou is a famous Li Canal city. When Yang Di dug a canal in Yangzhou, Yangzhou became the hub of north-south traffic. Thanks to grain transportation, it has become one of the most prosperous areas in China.