| With China's rapid economic development, the State Council, Tianjin, re-positioning, to build an international port city of Tianjin, northern economic center and the ecological city. More and more ideas, business, human resources, technology poured into Tianjin to promote the development of Tianjin. Growing demand has resulted in outward expansion of urban space constantly, even so, the pressure is still great urban centers, urban traffic load as the lifeline of the city near saturation, the crowded city street, piercing the noise pollution caused by car-ming, motor vehicle emissions large number of greenhouse gases, all created for urban development and advanced city and hindered harmonious ecological city does not match, how to solve urban traffic problems become a priority. Paper the case in other countries around the world and select a research focus on urban mass transit, rail transportation is convenient, comfortable, environmentally friendly, small footprint advantages of large shipments, and the road transport system to share the pressure of urban public transport, and because the extension of rail , so the city can use expand, smooth expansion of city scale, drive along the common development of certain industries or block.This article first urban location in Tianjin economic conditions and traffic conditions are briefly reviewed, the problems raised and solved between. On the needs of urban construction and urban construction planning of urban rail transit construction reached the significance of building the city. Finally, an example of urban rail in the Metro Line analysis of the implementation of the necessity and possibility. |