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In recent years, with the economy as a whole to speed up the rate of environmental change, as well as China’s capital market development, increasing the rational investors, listed companies for the full disclosure of accounting information, transparency requirements, as well as useful information is also rising. However, our current disclosure system is not perfect, mandatory information disclosure has been difficult to catch up with the changes in the information needs of investors.The need for more voluntary disclosure of information to supplement and deepen the content of the mandatory information disclosure.According to literature, the Asian region should be a voluntary act of disclosure of particular concern because companies in these areas compared to Europe and America there are fewer companies to make voluntary disclosure of the motivation. United States, Britain and continental Europe and other countries made a lot of this area. In contrast,Asian countries on the voluntary disclosure of the extent and nature of the study less. Therefore, the results of research in this article is a listed company in Asia Voluntary Disclosure a useful complement to the practice of understanding.On the other hand, to understand why the company for voluntary disclosure of information to prepare, and policy makers a useful and beneficial to users. Therefore, this article summarizes the research at home and abroad on the basis of which the company introduced the concept of quality of listed companies in the study years, with companies qualified to represent the information that may affect the voluntary disclosure of the main factors.In this paper, to Shanghai in 2007 annual reports of listed companies as samples, Samples of the company’s voluntary disclosure of information on extent of measurement, through multiple regression analysis to test the 7 factors reflected in company qualifications impact on the voluntary disclosure of information on the extent.The results show that:listed companies to voluntary disclosure of information basis with the level of company size, profitability, the company’s level of competition in the industry as well as overseas markets are positive related. And the largest proportion of shareholding is in negative correlation. All in all, where in the blue-chip stocks, large-scale, a more reasonable share structure,to have the ability to foreign companies listed more than willing to carry out voluntary disclosure so as to enhance the company’s value.
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