By comparing the correlation between the Board Structure and earnings management and the correlation between a company’s internal financial monitoring mechanism and its earnings management, the research here is aimed at finding out if there is any apparent difference between these two correlations. The abnormal accrual is used as a proxy variable of the managerial range of earnings. The result of the empirical analysis is listed below: 1. The larger the scale of the board, the smaller the managerial range of earnings. 2. The larger the percentage of the directors and supervisors stock ownership pledged the smaller the managerial range of earnings. 3. The larger the percentage of the directors and supervisors from outside the organization, the larger the managerial range of earnings 4. No prominent correlation between managers’ stock ownership ratio and earnings managerial behaviors. 5. The larger the number of times of changing the finance managers or internal audit schedules, the larger the managerial range of earnings.