Motivation The objectives of this study are to check the corporate governance infl uential in earnings levels and total return of the companygiven accounting informativeness of turnover declaration in Thai Capital Market, referring to the system of corporate governance mechanisms based on the confl ict of agent interests in 2010–2012. This study used the earnings persistence system as proxy of corporate earnings level. Eugene F. Fama (1970) stated that market effi ciency infl uenced future earnings. Apart