This paper studies the relationship between managerial power,internal control quality and earnings management. We find that:1) The internal control quality is negatively related to earnings management. 2) CEO's structure power plays a negative moderating role in the relationship of internal control quality and the accrued earnings management,which demonstrates the CEO acted as board of director increases the agency costs between shareholder and manager.3) The expert power has a positive moderating effect on internal control quality and the accrued earnings management,which means the CEO's longer tenure can enhance the internal control quality's inhibition effect on the accrued earnings management. 4) The reputation power has a positive moderating effect on the relation of internal control quality and the accrued earning management,which means the higher education background of CEO is favorable of improvement of internal control quality.