【正文】 and environmental protection, but less attention has been paid to social justice. Social justice (equity) contains economic equity and environmental equity. Economic equity issues resulting from congestion pricing are difficult to address pletely. Some people have argued that road pricing is regressive, in that it will bear more heavily on poorer car users, short distance journeys, and on those living adjacent to the cordons。Congestion Pricing and Sustainable Development of Urban Transportation system Jianhu Zheng (Department of Automobile Engineering, Minjiang University, Fuzhou, Fujian, 350108, China) Abstract The rapid growth in urbanization and motorization generally contributes to an urban transportation system that is economically, environmentally and socially unsustainable. The result has been a relentless increase in traffic congestion. Road congestion pricing has been proposed many times as an economic measure to fight congestion in urban traffic, but has not seen widespread use in practice because of Some potential impacts of road pricing remain unknown. The paper first reviews the concept of sustainable transportation system, which should meet the goals of economic development, environmental protection and social justice collectively. And then, based on the characteristics of sustainable transportation system, how congestion pricing can contribute to economic growth, environmental protection and social justice is examined. Examination result shows that congestion pricing is a powerful way to promote the sustainable development of urban transportation system. 1. Introduction Urban transportation is a pressing concern in mega cities around the world. Along with China’s rapid development of urbanization and motorization, traffic jams has bee a more and more serious problem, resulting in greater time delay, increase of energy consumption and air pollution, decrease of reliability of road work. In many cities traffic congestion is seen as a hindrance to economic development. Numerous methods can be used to address congestion and reduce transport density, including building new infrastructure, improving maintenance and operation of infrastructure, and using the existing infrastructure more efficiently through demand management strategies, including pricing mechanisms. Congestion pricing has long been proposed as an effective measure to bat traffic congestion. The principle objective of congestion pricing is to alleviate congestion by implementing surcharge for the use selected congested facilities during peak time periods. By shifting some trips to offpeak periods, to routes away from congested facilities, or to higheroccupancy vehicles, or by discouraging some trips altogether, congestion pricing schemes would result in savings in time and operating costs, improvements in air quality, reductions in energy consumption and improvements in transit productivity. There are lots of successful applications in some countries and regions in the rest of the world. Following Singapore in the early 1970s and Norwegian toll rings in the mid1980s, the city of London introduced its area toll in February 2020。 up till now, it is the most wellknown example of a large metropolitan area that has implemented congestion pricing. However, congestion pricing has not seen widespread use in practice due to theoretical and political reasons. Some potential impacts of road pricing remain unknown, and the sustainability of congestion pricing for urban development requires further study. Sustainability is normally taken as basic objectives in the assessment of transportation policy. The idea of sustainable transportation emerges from the concept of sustainable development in the transport sector and can be defined as follows [1], “sustainable transportation infrastructure and travel policies that serve multiple goals of economic development, environment stewardship and social equity, have the objective to optimize the use of transportation systems to achieve economic and related social and environment goals, without sacrificing the ability of future generations to achieve the same goals”. Sustainable transportation systems require a