Abstract:Using 2012-2020 listed companies in China's heavy pollution industry in Shanghai and Shenzhen A-shares as the research object, we empirically test the effect of board green interlocks on green technological innovation after green M&A and explore the differential moderating effect of different types of environmental regulations on this relationship. It is found that (1) board green interlocks significantly promotes green technology innovation after green M&A of heavy polluting firms; (2) command-and-control environmental regulations negatively regulate the relationship between board green interlocks and green technology innovation after green M&A of firms, and market-incentive environmental regulations U-regulate the relationship between the two. Heterogeneity analysis shows that the promotion effect of board green interlocks on green technology innovation after green M&A in heavy polluting firms is more significant in non-state owned enterprises, high R&D investment firms and high competitive industries. Therefore, when making major decisions on green M&As, firms should pay attention to the informal system of board green interlocks and play its role as an inter-firm information channel to promote green technology innovation in heavy polluting firms.