ABSTRACT This study has S commercial banks 104 branches from year 2010 to 2011 as researching sample. This research was to examine the operation performance and by using Data Envelopment Analysis (DEA) and Malmquist Productivity Index. In this research, find the most efficiency and most inefficiency Branch, and evaluate factors which effect efficiency during 2010 to 2011 ,in order to discover the source of operation inefficiency and make suggestions to possible improvements. The result will provide for decision makers’ reference and improve industry operational efficiency. The empirical results are: 1.To use Malmquist Productivity Index, that the overall banks in the period 2010 to 2011 productivity growth of state. 2.The application of data envelopment analysis (DEA) of the CCR and BCC models to obtain the bank''s overall business efficiency value is inefficient. 3.The bank has branches over 59% belong to the state of decreasing returns to scale, and its sultssignificantly. Show that most of the branches need to increase its operations to improve the performance of the production efficiency of banks.