摘要：本文以市场准入负面清单制度的实施作为市场准入管制放松的准自然实验，选取中国A股上市公司数据，使用双重差分方法，分析了市场准入管制放松对企业ESG表现的影响。研究发现，市场准入负面清单制度能够显著提升企业ESG表现。作用机制检验发现，市场准入负面清单制度通过增强市场竞争程度、提升社会信任水平、提高企业资源配置效率显著提升企业ESG表现。异质性分析发现，对于大规模企业、非重污染行业以及地方政府干预程度较高地区的企业，市场准入负面清单制度对企业ESG表现的提升作用更明显。本文的研究结果为我国完善市场准入制度与实施可持续发展战略提供了理论依据和政策启示。

Abstract: This paper takes the implementation of the negative list system for market access as a quasi-natural experiment of market access deregulation, selects data of Chinese A-share listed companies, and analyzes the impact of market access deregulation on corporate ESG performance using the difference-in-differences method. The study finds that the negative list system for market access can significantly enhance corporate ESG performance. The mechanism test shows that the negative list system for market access significantly enhances corporate ESG performance through the channels of enhancing market competition, promoting social trust, and improving the efficiency of resource allocation. Heterogeneity analysis indicates that, in large-scale enterprises, non-heavily polluted industries, and enterprises in regions with high degree of intervention by local governments, the negative list system for market access has a more significant promoting effect on corporate ESG performance. The results of this paper provide theoretical basis and policy inspiration for improving the market access system and implementing sustainable development strategies.