為了落實賦稅公平、實現社會正義，財政部推出證券交易所得課稅方案，希望能達到此目標。為探討資本市場對證券交易所得課稅方案演變的預期，本論文利用事件研究法探討在證券交易所得稅復徵消息公布至通過三讀立法期間之相關事件，對上、市櫃公司之股票累積異常報酬率之影響，並採用迴歸模型探討該股票累積異常報酬率與公司特性之關聯性。 本論文之研究結果發現： 1.在證券交易所得稅相關消息公布之事件日，上市櫃公司均產生顯著之股票累積異常報酬率。 2.課徵證券交易所得稅相關消息公布之事件期間，股票累積異常報酬率與公司特性關聯性之迴歸結果顯示：公司規模較大之公司，其公司股票累積異常報酬率較高；負債比率較高、公司成長性較高之公司，其公司股票累積異常報酬率較低。 / In order to implement the principle of fair taxation, Ministry of Finance, R.O.C. address that gains from securities transactions shall be subject to income tax. The amendment is expected to have impacts on stock market returns of all companies. Using event study methods, this study examines the stock market reactions to the announcements of the legislature policy and explores the relation between the stock cumulative abnormal returns (CAR) of the amendment and firm characteristics. This study finds that the stock market reacts negatively (positively) when the news of the amendment are released (revised). The regression results indicate that CARs are negatively related with debt ratios and corporate growth; positively related with corporate size.