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In recent years, there were many researches on China Free Trade Pilot Zone (FTZ), however, there was still a lack of research on the effect of the FTZ on trade efficiency. To make up for gaps in research, this paper calculated the trade efficiency of 30 provinces in China with stochastic frontier gravity model, and then empirically tested the policy effect of the FTZ by using the propensity score matching and difference in difference (PSM-DID) method, and further analyzed the inherent mechanism. The results showed that China’s general level of trade efficiency was relatively low, while the average trade efficiency in FTZs was significantly higher. The establishment of the FTZ had a significant positive impact on trade efficiency advances. Before and after the establishment of the pilot free trade zone, the difference between the changes in the trade efficiency measurement results of the treated group provinces and the trade efficiency measurement results of the control group provinces showed the characteristics of first increasing and then decreasing, and the policy effect has a certain lag. The establishment of the FTZ significantly reduced the trade cost. The model estimated that the trade efficiency increased by 3.576% for every 1% growth of trade cost, and the policy effect of the FTZ was significantly positive, which verified the existence of the intermediary effect of trade cost.

Free trade zone (FTZ) in China has been demonstrating remarkable achievements since its establishment, yet its effects on the environment in the zones cannot be ignored. However, there is still a lack of research on the impact of the quasi-natural experiment in the China pilot FTZ on China’s environment. Based on this, this paper uses panel data from 196 cities in China from 2010 to 2017 and uses the propensity score matching and difference in difference (PSM-DID) model to empirically test the environmental effects of the establishment of the FTZ. The result shows that there is an obvious causal relationship between the establishment of the FTZ and environmental quality. The establishment of the FTZ has exacerbated the environmental pollution problem in the pilot zone. Through a series of robustness tests, it is concluded that the estimated results of the benchmark model are robust. However, after a further study on whether the effect of the FTZ on environment is time varying, it was found that the effects of the FTZ on the environmental pollution in the test zones gradually weakened over time, which means that with the gradual maturity of China’s free trade pilot zone, the positive effect on environmental improvement will gradually highlight.