In 2014, the Beijing-Tianjin-Hebei Collaborative Development Strategy (hereinafter the Jing-Jin-Ji Strategy) was formally proposed as a major national strategy, providing an unprecedented opportunity for the overall development of Hebei. This article evaluates the treatment effects of the Jing-Jin-Ji Strategy on Hebei’s economy and environment. Employing a panel data program evaluation method developed by Hsiao et al. (2012), we construct hypothetical counterfactuals for the GDP growth rate, the percentage of tertiary industry in GDP, and the geographic mean PM_2.5 concentrations for Hebei in the absence of the Jing-Jin-Ji Strategy using the outcomes of selected untreated provinces. The results show that the Jing-Jin-Ji Strategy increased the percentage of tertiary industry in GDP by an average of 2.53 percentage points per year between 2014 and 2018 and decreased the geographic mean PM_2.5 concentrations by an average of 11.1 percentage points per year between 2014 and 2017. However, it does not appear to have had significant effects on Hebei’s GDP growth rate. The leave-one-out method demonstrates the robustness of the above results. This article suggests that Hebei should speed up its economic growth and bridge the gap with Beijing and Tianjin while ensuring the quality of its economic development and a sound ecological environment.

2014年，京津冀协同发展战略（以下简称京津冀战略）作为国家重大战略正式提出，为河北整体发展提供了前所未有的机遇。本文评估了京津冀战略对河北经济和环境的治理效果。采用 Hsiao 等人开发的面板数据程序评估方法。(2012)，我们构建了 GDP 增长率、第三产业占 GDP 的百分比和地理平均 PM _{2.5 的}假设反事实使用选定的未处理省份的结果，在没有京津冀战略的情况下，河北的浓度。结果表明，京津冀战略使第三产业占GDP的比重在2014年至2018年间平均每年提高2.53个百分点，而地理平均PM _2.5浓度在2014年至2018年间平均每年降低11.1个百分点。 2014 年和 2017 年。但是，它似乎没有对河北的 GDP 增长率产生显着影响。留一法证明了上述结果的稳健性。本文建议河北在保证经济发展质量和良好生态环境的同时，加快经济发展，缩小与京津冀的差距。