Please collect information online and talk about the historical value of the Beijing-Hangzhou Grand Canal.

After the Beijing-Hangzhou Grand Canal was completed, it connected the political center and economic center of the whole country with its unique communication function, and connected the production areas of different river basins. On this basis, the rulers of the feudal dynasty established a water transport system with a history of thousands of years, which transported materials from all over the country to the capital and maintained the life of the dynasty. [5]

In the process of water transportation around the canal, the relevant links of grain allocation, collection, transportation, escort, unloading, storage and storage are constantly updated and developed according to local conditions in the actual process, which makes the grain transportation system develop and change several times. Every change is developed by summing up experience and lessons in practice and seeking truth from facts to solve problems. For example, Pei Yaoqing, the prime minister of the Tang Dynasty, changed the "direct grain transportation method" to the "segmented grain transportation method", that is, the water in the tank is generally used for grain transportation, the shallow water is used for storage, and the granary is located along the canal. In this way, the tanker does not stagnate, and there is no loss of grain, which greatly improves the grain transportation capacity. In the late Tang Dynasty, based on the "sectional transportation method", the "transshipment method" was created, which changed the people's movement into official transportation, changed the bulk transportation into standard sacks, and organized ships. Transportation is systematic and organized. Establish a grain transportation reward system, take salt profit as commission, and solve the problem of grain transportation funds. These innovations have effectively promoted the development of grain transportation. In Song, Yuan, Ming and Qing Dynasties, according to the actual situation of the canal, the methods of water transportation were constantly innovated to better play the role of the canal. [5]

During the Ming and Qing dynasties, the rulers' use of the canal also changed pragmatically. During the Ming and Qing dynasties, with the development of commodity economy, the market behavior of society increased day by day, and the demand for material exchange between North and South increased greatly. On the one hand, water transport has stimulated the development of commercial activities along the canal, on the other hand, water transport itself has become more and more commercialized. First, the goods were smuggled in the water transport, from less to more. There was nothing the imperial court could do. Instead, it took the initiative to explicitly allow tankers to carry certain goods when they went north, and to allow passengers to transport when they returned south. This change in grain transportation policy is a pragmatic approach of the government. On the one hand, the smuggling of oil tankers is an existing fact and cannot be stopped. On the other hand, it can subsidize the livelihood of oil tankers. At the same time, officials and gentry in Dajia also have this demand. The volume of goods carried by waterwheels is increasing day by day, the trade of waterwheels is becoming more and more active, and many commercial towns have emerged along the canal. Such as Tongzhou, zhi gu (Tianjin), Cangzhou, Dezhou, Linqing, Xuzhou and Huai 'an. Silk, tea, sugar, bamboo, wood, lacquer and ceramics from the south are continuously transported to the north, and pine, leather goods, coal and sundries from the north are also continuously transported south through the canal. Although the Grand Canal was opened for water transportation, when there was a demand for commercial transportation in the times, the rulers also kept pace with the times, making it a river for commercial transportation and people's transportation.