轨道交通以其运量大、速度快、时间准、污染少、占地少、交通事故少等独特的优势而备受世界各大城市的青睐,并逐步成为解决大城市交通问题的有效途径。当前世界大城市轨道交通的发展主要呈现出三大特点:一是类别多样化;二是轨道运行网络化;三是资金来源多元化。而国内大多数城 Rail transit has been favored by the world’s major cities for its unique advantages of large capacity, fast speed, accurate time, less pollution, less land occupation and less traffic accidents, and has gradually become an effective way to solve traffic problems in big cities. At present, the development of rail transit in the world’s major cities mainly shows three major characteristics: one is the diversification of categories; the other is the network operation of orbital operation; the third is the diversification of funding sources. Most cities in China