我國於2000年底,通過「金融機構合併法」,並在2001年6月27日公佈「金融控股公司法」,且於2001年11月11日正式實施。之後陸續通過「金融資產證券化條例」、「金融監督管理委員會組織法」等法案,以推動金融控股公司的成立,使金融機構開始進行合併和創新,提供客戶「一次購足」的服務,減少許多時間、人事與管理等成本。因此為追求更大的業務範圍以及獲取更多的利潤,臺灣地區金融控股公司相繼成立,並不停進行購併行為,使業務多元化,金融機構購併主動性、被動性之動機不同,而通路、客戶規模數量、資產品質、經營團隊暨業務經營能力、購併價格及員工權益等,是影響購併目標之選擇重要因素。本研究主要以本國有購併行為的金融機構為研究對象,分析購併行為對金融控股公司股價報酬率的影響。對於不同購併型態宣告所產生的經濟利益,在不同的事件窗口下的確有所不同,其訊息宣告的反應時間亦不相同。;In the end of year two thousand, through "financial institution merger law", and in Jun,27,2001 the government announced "financial holding company", and implemented in Nov,11,2001. Continually Passed "regulations on securitization of financial assets", "Financial Supervisory Commission organic law" legislation, in order to promote the establishment of financial holding companies. Financial institutions began to merge and provid customers the "one shopping" service for management costs reduction, In other words they can get more profit. Nearly years there are some financial holding companies have established in Taiwan. These financial institution purchased and initiative makes business diversification. About customer scale number, assets quality , business team ability, purchased price and the employees interests, and etc. is the important factor of merger select. This study focus Taiwan’s companies analysis acquisition and merger behavior influence rate of return on the financial holding company′s shares. For different purchasing patterns and declared the economic benefits, vary in different events under the window whose message declared response times are not the same.