The effects of the independence of board of directors on the relevance of earning's information for decisions by investors in stock markets is the subject of this study. This independence is considered very important within the monitoring and directing roles played by boards of directors on the working of and decision making by corporation's management. In addition, accounting earnings represent the key base for accrual accounting in particular and in accounting process in general. Two factors reflecting investors usage of earning relevance in their decision making are employed to determine the relevance of earning information that are (i) the ability of these earning to forecast future cash flows (ii) and valuation contents of these earnings in stock markets.