Abstrac---After the share structure split reform, the relationship between Ownership Concentration degree and corporate performance is the focus of the community. In this study, we select 300 Index companies listed in Shanghai and shenzhen stock exchange during 2007-2009 as samples, and use regression models to inspect the the relationship between ownership concentration degree and corporate performance,it found that Ownership Concentration degree and corporate performance show a positively correlation in generally:The shareholding proportion of the largest shareholder, The shareholding proportion of the top five largest shareholders and the Herfindahl index and company performance show a significantly positively correlation; Z index and company performance show a significantly negatively correlation, that is, The greater the difference between the shareholding proportion of the largest shareholder and The shareholding proportion of the second largest shareholder, the worse the firm performance.
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