由於過去對於盈餘管理之相關研究，多著重於年報盈餘管理之動機，因此，本研究改以季報之盈餘管理來探究公司進行季盈餘管理之動機。本研究之實證結果顯示：各季盈餘管理程度係呈現遞增之情況，並無顯著於核閱期間進行較多盈餘管理之情形；季可裁決應計項目與現金增資或發行公司債呈正相關；季可裁決應計項目與營運活動現金流量變動呈負相關；季可裁決應計項目與短期償債能力呈負相關；盈餘管理會受前一季盈餘管理影響；季可裁決應計項目與負債比率呈負相關；季可裁決應計項目與公司成長潛力呈正相關。透過本研究，相信有助於實務上投資人據以偵測企業之盈餘管理行為，並協助其評估企業盈餘之品質。

Most previous earning management research papers focus on the motivation of earning management in annual reports. Instead, our research focuses on the motivation of earning management in quarterly reports. The results indicate that quarterly earning management increases quarter by quarter, no significant increase in the 1st and 3rd quarters. Quarter discretionary accruals are positively associated with the seasoned equity offerings. Quarter discretionary accruals are positively associated with the changes of operating cash flow. Quarter discretionary accruals are negatively associated with the acid ratio. Quarterly earning management is influenced by previous quarterly earning management. Quarter discretionary accruals are negatively associated with the debt ratio. Quarter discretionary accruals are positively associated with the growth opportunity. The results are helpful for investors to detect earnings management and to analyze the earning quality of listed companies.