本研究目的為透過實證分析研究2005年至2008年台灣上市櫃公司股票流動性與企業價值兩者之關係，企圖瞭解當考慮其他已證實會影響企業價值之因素，如：公司治理、資訊揭露程度、公司特有風險等因素後，股票流動性是否依然對企業價值存在影響力，即本研究將在控制公司治理程度、資訊揭露程度及公司特有風險等因素下，以周轉率作為股票流動性之代理變數、以Tobin’s Q作為企業價值之代理變數，分別使用普通最小平方法與兩階段最小平方法，檢視股票流動性是否依然影響企業價值。除此之外，亦參考Vivian W. Fang, Thomas H. Noe, Sheri Tice[2009]的研究方法，將代表企業價值之Tobin’s Q拆解成其他三個變數：營業利益對股價比、權益佔資產比及資產報酬率，取代企業價值成為應變數，再以相同研究模型對股票流動性進行實證分析，以求瞭解股票流動性影響企業價值之背後原因。最後，將研究樣本分別依照不同程度之公司治理、不同程度之資訊透明度、不同程度之公司特有風險分成低、中、高三組，以普通最小平方法分析在不同程度之控制變數下，股票流動性對企業價值之影響是否不同。本研究結果如下：第一、股票流動性越高之企業，其企業價值亦越高。第二、股票流動性高的企業，擁有較低之負債比與較高之資產報酬率，是企業價值高的中間影響因子。第三、在不同的董監持股比率、董監質押比率、法人持股比率、獨立董監比率、資訊揭露程度及公司特有風險下，流動性對企業價值的影響力是不同的。公司治理越差、資訊揭露程度越低、公司特有風險越高的公司，其流動性對企業價值越具顯著影響力。 / This paper investigates the relationship between stock liquidity and firm performance in Taiwan by using both of Ordinary Least Squares method and two-stage least squares method. To access whether stock liquidity improves, harms, or has no effect on firm performance, a proxy for Tobin’s Q is regressed on the liquidity measure, stock turnover, and several control variables, for example, corporate governance, information transparency, idiosyncratic risk, etc. Next, In order to gain further insight into the source of higher firm performance for stocks with high liquidity, based on Vivian W. Fang, Thomas H. Noe, Sheri Tice (2009), I break Tobin’s Q into three components: price-to-operating earnings, financial leverage, and operating profitability and then use these three variables as dependent variables to be regressed respectively on the liquidity measure in the same regression model. Besides, I also examine whether the effect of high liquidity on firm performance is different for firms with different level of each control variable. At last, this study shows that liquidity positively affects firm performance and proves that stocks with high liquidity not only have better firm performance, but also have more equity in their capital structure and higher operating profitability levels. This study also finds that the effect of stock liquidity on firm performance is significantly different for firms with different level of control variables.