This thesis researches the development process of financial certificate in Taiwanese banking. In recent years, financial certificate is an important phenomenon in the workplace of finances. Previous studies focused on the impact of the certification, discuss the formation of financial certificate less. In this article, the view of institutional change regards the banking certificate institution as long duration to consider state, the different period of capital and other actor that have different mechanisms of their interactions in institutional formation process. The research method of this thesis adopt analysis of historical documents and interview to understand the formation of financial certification. Study found that the development of the banking certificate can be divided into three stages: the first stage is incubation. Financial employees in the era of state-owned banking had quasi-public servant status, and rely on the apprenticeship training skills through examinations. In the financial liberalization policy, the new banks joined the market so that employee turnover was high; with college increasing rapidly, in the past through internal training structure had become break down. At the same time, the state proposed the Asia Pacific Financial Center from the traditional conservative financial policy to active, established Taiwan Academy of Banking & Finance (TABF) to handle related business of financial certificate, and created the precedent of certification. The second stage is after that establishment of financial holding companies. The finances boundaries are broken. The banking business is more and more complexity. Securities certificate institution having long been customary in securities industry is further stable. The number of banking certificate increased sharply in this stage. The third stage is Institutionalization. TABF develop new certificate continuously, make kinds of banking business certificated, but employees tend to lukewarm response, examinees turned down sharply. At this time, certification is an institutionalization action to pursuit of legitimacy, rather than respond to real needs. This article affirms the view of new institutionalism, and point out the initial of institutional formation indeed response to new financial development. However, at a later stage the action of institutionalization is only for pursuing legitimacy.