Abstract:Abstract: We recognize that it has close relations between listed firm’s innovation output and its Success or Failure in M&A activity. Simultaneously, the innovation output is influenced by the corporation’s proportion of institutional ownership. The essay analyzes the innovation output of successful and failed merged firms to verify the causality between M&A activity and a firm’s innovation incentives. Moreover, we find that the firm’s Success or Failure in M&A activity is influenced by its financial situation, and the successful merged firms have positive CARs around the announcement date. Overall, the essay proves that the success or failure in M&A activity has an important influence on the firm’s innovation output.