天津始于隋朝大运河的开通,在南运河和北运河的交汇处、现在的金钢桥三岔河口地方,史称“三会海口”,是天津最早的发祥地。唐中叶以后,天津成为南方粮、绸北运的水陆码头;金代在直沽设“直沽寨”,元朝设“海津镇”,是军事重镇和漕粮转运中心。1860年天津被辟为通商口岸后,西方 Tianjin began with the opening of the Grand Canal in the Sui Dynasty. At the confluence of the South Grand Canal and the Grand Canal, the present Sanchahekou, where the steel bridge is located, is known as the “Sanhui Haikou” and is the earliest birthplace of Tianjin. After the middle of Tang Dynasty, Tianjin became the land and sea terminal for the southern grain and silk north transportation. In the Jin Dynasty, it set up Zhiguguzhai in Zhiju and the sea town in Haiyuan in the Yuan Dynasty. It was the military center and the grain transport center. Tianjin was turned into a treaty port in 1860 after the West