Yang Di wanted to dig the Grand Canal, mainly to strengthen the north-south traffic and consolidate the rule of the Sui Dynasty over the whole country. After the reunification of the Sui Dynasty, Emperor Wendi of Sui Dynasty made great efforts to govern the country, adopted a series of measures to reform the system of the former dynasty, strengthened centralization, and achieved rapid social and economic development. During the reign of the emperor, the Sui Empire had a vast territory, strong national strength, and a large increase in population and cultivated land, which meant that the Grand Canal had economic strength. The unification of the Sui Dynasty made it possible for Yang Di to recruit millions of people. It is based on several ancient canals dug in the previous generation. After the opening of the Grand Canal, it not only became a political, economic and cultural link between the north and the south, but also became a hub to communicate the "Silk Road" in the inland of Asia and the "Silk Road" at sea. Promote the development of towns, industry and commerce in coastal areas.