| Summary: | 碩士 === 逢甲大學 === 會計學系 === 102 === We use Securities and Exchange Commission (SEC) which announces the firms’ Audit Fee annual reports from 2006 to 2011 all the listing companies in U.S.A to discuss that the impact of information disclosure of Audit Fee to firms’ valuation and also discuss Investor Responsibility Research Center （IRRC） that announces the negative corporate governance provisions weather cause the result information disclosure of Audit fee from firms’ valuation. We find that information disclosure of Audit Fee is positive correlated with firm’s valuation. Furthermore, when the firm’s information disclosure of Audit Fee is increase, the firm’s valuation is increase, too; however, in the same time if the firm’s “Entrenchment Index （EI） of corporate governance provisions” are also increase, it may cause the impact of information disclosure of Audit Fee decrease. Similarly, when the firm’s “Constitutional limitations on shareholders’ voting power (CLOSVP) of corporate governance provisions” and “Takeover readiness provisions （TRP） of corporate governance provisions” are increase, those may cause the impact of information disclosure of Audit Fee decrease.
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