Abstract: Shijiazhuang City had serious air pollution problem. To study the coupling coordination relationship of environment, transportation and economy systems is of great significance for regional sustainable development. The coupling coordination model and the scissors difference method were selected to comprehensively analyze the degree of coupling coordination of economic-transportation-environmental system and the difference of evolution direction and rate among different systems in Shijiazhuang from 2000 to 2016. It has been found that the coupling coordination index of Shijiazhuang economic-transportation-environmental system increased from 0.42 to 0.77 from 2000 to 2016, which indicate that the coupling coordination relationship of the three systems in this city was gradually improved during the research period. From the perspective of development level, environment, transportation and economic systems scored 0.53, 0.39, and 0.35, respectively, indicating environmental system developed better than transportation and economic systems. From the perspective of evolution direction, the differences between economic and transportation system, and between transportation and environmental systems were gradually decreasing, while the differences between economic and environmental systems was gradually increasing. The smaller the difference were, the more consistency the two systems was. From the perspective of evolution rate, the three systems scored 0.01 (environment), -0.04 (economy) and -0.11 (transportation), respectively. The research shows that the environmental quality of Shijiazhuang has been improving rapidly, while the development of economy and transportation construction needed to speed up.

Key words: economic-transportation-environment, coupling, scissors difference, Shijiazhuang