近幾年來，發生了許多會計醜聞的案件，使得投資大眾開始關注盈餘品質與審計品質之間的關係。而Sarbanes-Oxley Act of 2002也針對此問題，訂定相關的規範，此外更要求會計事務所每五年必須輪調一次，以防舞弊事件發生。因此，本研究擬探討審計輪調制度與盈餘管理之間關係。

　　本研究以我國上市公司為研究對象，包括了18個產業。對於盈餘管理以裁決性應計項目和特殊項目作為代理變數，而審計輪調則以會計事務所為計算單位。研究期間為1993年至2002年，以迴歸方式進行實證模型分析。

　　本研究主要探討議題共分為兩部分，一、盈餘管理絕對值與審計任期之關係。本研究以裁決性應計項目和特殊項目絕對值為應變數，會計事務所任期為自變數。二、盈餘管理效果與審計任期之關係。本研究進一步將盈餘管理分為淨利增加和淨利下降部分，探討其效果的影響。

　　本研究之實證結果發現：絕對值部分，裁決性應計項目與審計任期為負相關，反對審計輪調制度；而特殊項目卻為正相關，贊成審計輪調制度。另外，在盈餘管理效果方面，裁決性應計項目正負值與審計任期有顯著相關，代表任期愈長有抑制盈餘管理效果；而特殊項目負值與審計任期卻有負相關，代表審計任期愈長對於淨利下降效果的盈餘管理有增加的趨勢。

　　In recent years, the accounting scandals have focus the public’s eye on earnings quality and on audit quality. For solving the problem, the Sarbanes-Oxley Act of 2002 made several related regulations, and required the audit-firm to mandate rotation in every 5 years. Therefore the paper examines the relation between audit rotation and earnings management.

　　The two mainly themes of this study are:
1. the relation between the absolute value of earnings management and audit-firm tenure.
2. the relation between the effect of earnings management and audit-firm tenure.

　　We find a significant negative relation between absolute discretionary accruals and tenure which is consistent with the supporting mandatory rotation. However, there is a significant positive relation between absolute special item and tenure, consistent with the opposing mandatory rotation. Then we divide the effect of earnings management into income-increasing and income-decreasing. The results show that there is a significant negative relation between signed discretionary accrual and tenure. The longer tenure can constrain management to manipulate earnings. On the contrary, there is a significant negative relation between negative special items and tenure. It shows that the longer tenure the more income-decreasing earnings management.

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