The Grand Canal is the traffic artery of Sui, Tang and Song Dynasties. Tongji Canal connects the Yellow River and Huaihe River, transporting rich products and grain from Jiangnan and Jianghuai areas to the north, and solving the supply of the capital and the army. This can't be solved by land transportation by human carriage. The Grand Canal has also promoted the prosperity of towns on both sides of the strait, promoted the great development of commerce, foreign trade and tourism throughout the country, and formed the Canal Economic Belt. During the Tang and Song Dynasties, China's water transportation was developed, and it was the Grand Canal that ensured the supply of materials and reached the peak of China's history. No wonder Zhang Jiali, director of Anhui Cultural Relics Bureau, said, "The Grand Canal of Sui and Tang Dynasties was the lifeblood of the dynasty at that time, and its outstanding role surpassed that of the Silk Road".