During the Republic of China, the rivers flowing through Jinghai County included the South Canal, Ziya River, Daqing River, Machang River and Heilonggang River, especially the South Canal. South Canal from Tianjin to Jinghai Tangguantun Jiuxuan Gate Section. The width of the river varies, and the water depth varies from 7 to 9 feet. Ship traffic in the county is free and shipping is busy. Only during the winter freeze, the ship traffic stops. The South Canal has a dense population, rich residents, developed commerce and trade, and heavy traffic. Liu Du, Tangguantun, Jinghai Town and so on are all big market towns arising from canals. Civilian ships are mostly concentrated in the docks of various towns, which is called "landing on the spot". At that time, there was a shipowner's organization in Liu Du Town-Boating Club. The boat club will be divided into two boat clubs, South Street and North Street, with another president, who will be responsible for inviting the crew to get together once a year, set up a stage, sing and make peace. According to the statistics at that time, there were 170 boatmen in Liu Du Town and more than 50 in Tangguantun. Many cargo ships have their own names, such as "eight-character hanging", "all-inclusive" and "big blue flag". These ships went south to Cangzhou, Dezhou, Linqing, Xinxiang and many other areas, transporting salt and groceries south and grain and cotton north. Among these carriers, the deadweight is different, the largest is a pair of cabins with 100 tons, and the smallest is a single ship with 10 tons. There are many kinds of ships with roughly the same shape. The most common are grain rowing boats, gun rowing boats and standard boats. Text/Zhang Hong Liu Cai Jun