本研究以常見於臺灣上市公司財務報表之關係人交易為研究主題，探討此一財務報表附註資訊之有用性，並進一步分析其資訊特性。關係人交易為本期全部影響財務報表之交易的一部分，在會計準則制定機構要求下，於財務報表附註中揭露此明細項目資訊。由於關係企業為國內企業經營方式主流，關係人交易之財務報表分析之重要性可見一般。 One of the salient feature of business environment in Taiwan is the formation of business groups. Companies are tied by various relationships, not necessarily through investment. Accordingly, transactions among affiliated companies are commonly seen. Financial accounting standards require related party footnote disclosure on relationships and transactions. Current study focuses on the usefulness of related party transaction disclosure. The attributed of information contained in the disclosure are also studied. This study hypothesizes that the information value of related party transaction disclosure comes from the information concerning equity agency cost and/or earnings quality. The usefulness of the disclosure is further demonstrated via the incremental information content analysis.