Abstract: Irresponsible corporate behaviors are constrained by both government regulation and product competition. This article builds a three-stage game model,analyzes the impact of government preference and execution on government regulation of irresponsible corporate behaviors,and reveals the paradox of government preference. Research shows that the key for a government to constrain irresponsible corporate behaviors effectively,is to make corporate losses from irresponsible behaviors exceed gains from those;no matter how the government prefers social interests,there exists a possibility that the government deregulates irresponsible corporate behaviors;the more the government prefers the social interests,the less a possibility of eliminating an irresponsible corporation from the market is;and,the paradox of government preference results from the duality of irresponsible corporate behaviors.

Key words: government regulation, CSR, Cournot model