Abstract: Linking both sides of the M&A event, setting up main variables such as CSR, corporation value, having empirical tests to check the relationships such as between seller's CSR before M&A and buyer's CSR after M&A, between buyer's CSR after M&A and its corporation value, between seller's CSR before M&A and buyer's Corporation Value after M&A, results show that the relationships between everyone of the 3 pairs above-mentioned are significant positive correlation, furthermore, also find that in the relationship between seller's CSR before M&A and buyer's Corporation Value after M&A, buyer's CSR after M&A palys a mediation role.

Key words: corporate social responsibility(CSR), corporate value, mediating effect