宋代的扬州呈现为“三城”并在的布局,这在中国城市发展历史上具有独特的典型意义。与西方由“市”(即市场)形成城市不同,中国的城市形成由“城”而成,它首先是作为战争防御系统而存在,并在此基础上发展起来的。故地处长江北岸的扬州城在冷兵器时代,因此具有非常重要的战略作用。为了保卫城市更为了守住宋赵氏王朝的半壁江山,当年的扬州城在唐代子城与罗城两座城的基上变化出大城、夹城、子城三座城池的格局。鉴于在一个城市里同时存在着“三 Yangzhou in the Song Dynasty showed the layout of ”Three Cities“ and its layout. This has a unique and typical significance in the history of urban development in China. In contrast to the western city formed by ”city “ (ie, the market), the formation of China’s cities from ”City “ is the first to exist as a system of war defenses and developed on this basis. Therefore, Yangzhou City, located on the north bank of the Yangtze River in the cold weapon era, has a very important strategic role. In order to defend the city more to hold half of Song dynasty dynasty, then Yangzhou City in the Tang Dynasty City and Luo City, two cities based on the city, city folder, sub-city three city pattern. Given the simultaneous presence of a city ”three