Abstract:Green mergers and acquisitions(M A)from the outside and green innovation from the inside are important strategies for companies seeking green development in the process of China"s economic transformation. Does green M A affect green innovation? Based on the M A data of my country"s industrial listed companies from 2009 to 2018, the study found that green M A can promote green innovation; and this promotion effect has persistence. Green M A promotes green innovation by obtaining the support of stakeholders such as the government, suppliers and customers. Furthermore, when the financing constraints of the enterprise are greater and the industry in which the R D intensity is higher, the promotion effect of stakeholder support is stronger. This article expands the research on the after-effects of green mergers and acquisitions and the influencing factors of green innovation, and also provides a reference for companies to promote green innovation from "outside" to "inside".