According to historical records, Tongzhou has always been the traffic artery of JD.COM. Grain transportation and storage are important places. Canal water transport, the national vein, the dynasties regarded Tongzhou as the elbow armpit, so Tongzhou has the reputation of "the town with nine elbows flowing up to the armpit and six throats". There were three major excavations in history, the earliest one being the Han ditch dug by Fu Cha, the king of Wu, in 486 BC. The second time was from 605 to 609, when Emperor Yang Di reopened the Hangou and extended it northward. The third time was from the Yuan Dynasty to the twentieth year of the Yuan Dynasty (now 1283), which was built vigorously and formed the scale up to now. Guo Shoujing presided over the opening of Tonghui River, and ships from the south can go back to Tonghui River to Beijing. Tongzhou Canal should have been dug during the great cause of Sui Dynasty. 1400 years ago. ?