Abstract:Based on the perspective of enterprise internationalization,this paper uses 4677 internationalized operation samples and 2465 paired samples from 2008 to 2015 to test the impact of international operation on over investment and the regulatory effect of institutional environment. The study finds that internationalized operation has a significant positive impact on over investment. Compared to non internationalized operating enterprises,the excessive investment probability of international enter prises is higher. In view of the intermediary role of institutional environment,the restriction of institutional environment reduces the excessive investment probability of enterprises,and the impact of international operations on over investment has been significantly reduced. Further research have found that the excessive investment and the impact of the institutional environment are more obvious in the non state controlling enterprises.