歷經兩次金改，我國本國銀行的家數從2000年最高峰53間，降至2014年的39間，但國內銀行金融服務市場已趨飽和，銀行家數過多且規模過小的現象仍然存在，近年存放款利差縮小，銀行間價格競爭日趨激烈，對於整體銀行業的獲利能力影響甚鉅。為利我國銀行掌握亞洲經濟成長契機，提升獲利及國際競爭力，金融監督管理委員會自2013年起推動金融業布局亞洲，提出「金融業打亞洲盃」的政策宣言，鼓勵金融業整併或參股海外機構以擴大規模。 元大金控係以證券投資服務為主體而發展之金融控股公司，亦是金融監督管理委員會點名最積極投入打亞洲盃的金控之一，2015年8月元大金控宣布併購大眾銀行，合併後由子公司元大銀行為存續公司。本研究採個案研究法，以元大金控併購大眾銀行為例，個別探討雙方發展現況及併購動機，並分析此併購案的策略目的及併購綜效。 本研究結果得出，元大金控藉由合併大眾銀行將產生以下併購綜效：(一)規模經濟效益、(二)均衡業務結構、(三)提升銀行獲利貢獻、(四)維持穩健資產品質，元大金控藉此拉升銀行業務的恆常獲利貢獻，進而轉型成證券及銀行雙主軸的金控，同時取得大眾銀行的香港分行，以香港為前進大陸的發展據點，經營兩岸三地金融服務市場，有助其朝向「亞太區最佳金融服務提供者」之願景邁進。 / After going through two financial reforms, the number of the banks in Taiwan had decreased from 53 banks in 2000 to around 39 banks in 2014. Still, the problem of an excess of the banking operators had persisted. Due to the saturated Taiwanese domestic market for commercial banking services, the interest spread had thinned remarkably and this oppressive situation had drawn the local commercial banks into a price war on interest rates on deposits and loans. In 2013, following the growing concern over the price competition and in the hope of enhancing international competiveness of Taiwan’s banking industry, Financial Supervisory Commission unveiled its plan—Asia Cup policy—to promote consolidation of domestic financial institutions and encourage them to invest overseas market to further scale up the business. Yuanta Financial Holdings, one of the holding companies that actively seek overseas business opportunities, was the biggest securities broker in Taiwan. After completing the acquisitions and mergers of Ta Chong bank in August 2015, the company not only remains the leading position in securities market but also further strengthens its banking business. The thesis is based on the M&A case, and the purpose of the study is to determine the reasons and motivations behind the M&A between two financial institutions as well as the company’s current development in order to analyze and understand what are synergistic gains that two banks benefit from the merger. In short, the study suggests that the merger between Yaunta financial holdings and Ta Chong Bank has created following M&A synergies—realizing economies of scale, balancing business structure, enhancing banking profitability, and maintaining steady asset quality. After merging with Ta Chong bank, Yaunta financial holdings transitioned from a securities brokerage-focused company to a holding company focused on Twins Pillar of securities and banking operations. Also, company’s Hong Kong branch, which was acquired from the M&A, will serve as a firm foothold in Chinese market in order for this banking giant Yaunta to achieve the goal of becoming best financial service provider in the Asia Pacific region.