Abstract: Ecological environment has become the key factor to realize the coordinated development of Beijing-Tianjin-Hebei region. In order to explore the impact of Beijing-Tianjin-Hebei ecological synergy policy on the efficiency of environmental regulation, based on China’s provincial panel data from 2009 to 2020, the paper took the Beijing-Tianjin-Hebei region as a whole as the research object, by using the super-efficiency SBM model and the synthetic control method, the effects of the implementation of the Beijing-Tianjin-Hebei eco-coordinated policy on the efficiency of environmental regulation were evaluated, and the effectiveness was tested. The results showed that the environmental regulation efficiency of Beijing-Tianjin-Hebei region showed an upward trend with a small fluctuation range, and there was still room for improvement. The implementation of the ecological coordination policy can promote the environmental regulation efficiency of the region as a whole，however, its growth rate is slow compared with other regions，indicating that the mechanism of ecological coordination between Beijing, Tianjin and Hebei needs to be further improved, and regional heterogeneity should be fully taken into account, we will gradually improve environmental regulation and ecological coordination in the Beijing-Tianjin-Hebei region, from the aspects of deepening the joint construction, prevention and control of the ecological environment, strengthening top-level design, and promoting the synergy of pollution and carbon reduction.

Key words: environmental regulation efficiency, Beijing-Tianjin-Hebei ecological coordination policy, synthetic control method