本研究應用無母數的馬奎斯特生產力指數，探討亞洲金融危機如何影響臺灣銀行業的營運效率。以1996年至2003年期間在臺灣營運的銀行為樣本進行分析，本研究之重要發現顯示，外國銀行之經營績效受到亞洲金融風暴之影響並不顯著。於研究期間內，外國銀行一直享有最高水準之效率。一般而言，其生產力亦呈現大幅度之成長。探究其原因，主要可歸功於其生產技術之快速提升，而非來自效率面之改善。至於本國舊銀行與本國新銀行，其效率變動之模式則顯得十分類似。它們均於亞洲金融危機初期有效率改善的跡象，但於金融危機發生之後連續五年，效率水準即迅速下降。進一步分析效率變動之來源，則可歸因於其規模效率之變動。此外，若以平均水準而言，本國舊銀行與本國新銀行的生產力於研究期間內，均呈現小幅衰退之現象。

This study attempts to explore the impact of Asia financial crisis on operational efficiency in banking using nonparametric Malmquist-index Analysis. Based on a sample of banks operating in Taiwan during 1996-2003, the main results show that the Asian Financial Crisis exerted no significant influence on the foreign banks. They had been enjoying the highest efficiency level and also achieved a high pace of productivity progress. Such rapid productivity growth was found to primarily result from technology advance rather than efficiency improvement. As for domestic banks, the patterns of efficiency changes from old banks and new banks seemed to be quite similar. In the initial stage of the financial turmoil, there existed some evidences of a turnaround within both bank groups. However, their efficiencies declined at a great rate for the five years after the turmoil. In this respect, changes in scale efficiency were found to provide the major sources of the efficiency changes. Furthermore, the results reveal that on average the productivity of both domestic banks diminished slightly during the period.