本研究就台灣上市母子公司之現金增資發行與新股發行海外存託憑證進行事件研究與發行個體的選擇研究，是否在母子公司的架構下因為發行個體的選擇會為公司帶來不同的宣告效果影響，進而提升公司籌資彈性。 在事件研究上，宣告發行新股對發行公司而言在發行公司為母公司時有負向的效果，子公司則可能因為成長機會存在而不顯著為正；對非發行公司而言，則無顯著價格效果存在，可見宣告效果僅存在於發行公司。與國外Vijh (2006)的實證研究結果相符。但母子公司架構下，母公司的管理階層仍有就發行個體作選擇。管理階層傾向選擇前期股價高估程度較高之公司進行新股發行；在子公司有資金缺口時傾向以子公司作為發行個體，然而在母公司有資金缺口時則不一定選擇以母公司為發行個體，可能因子公司通常為成長型公司，此時選擇以子公司發行對子公司股價影響程度較低。 / This study examines if parent-subsidiary structure is capable of enhancing a company’s financial flexibility by influencing the announcement effects of issuing SEOs and DRs in Taiwan. The event studies under the parent-subsidiary structure in Taiwanese companies show that: 1) When issuing companies are the parent company, issuing companies have negative announcement effect. 2) When issuing companies are the subsidiary company, issuing companies have non-significant positive effect, probably due to high growth potential of subsidiaries. 3) For non-issuing companies under parent-subsidiary structure, the evidence shows that there are no significant effects. Yet under parent-subsidiary structure, the executives do choose the issuing entity between parent and subsidiaries. Executives lean to choose more overvalue entity as issuing companies. And choose subsidiary to issue stocks when subsidiary do have positive deficit. But when parent company has deficit executives are not significantly choosing parent company to issue stock. This may be due to the reason that subsidiaries are usually with higher growth potential and result in less announcement effect on the stock price.