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Efficiency of economical units especially banks is one of the success factors in developed countries. In this regard, managers of the banks are responsible for the efficiency of them, which is not possible without evaluation of efficiency of the bank branches under the supervision of the managers. Data Envelopment Analysis (DEA) is a method for calculating the efficiency of various organizations having multiple-inputs multiple-outputs. This method leads to ordering of efficient and inefficient branches and identifying reference unit (DMU) to attain efficiency frontier. Also, effectiveness of each variable in efficiency of each unit can be determined. In this research, an input-oriented BCC model with envelopment form has been employed. Thus, the statistical data from 17 branches of Refah Kargaran Bank in Lorestan Province was collected during 2010-2011. The results show that there are 11 efficient branches (65% of the branches) and 6 inefficient branches. Inefficient branches were ranked in terms of their efficiency, and AP model was used for ranking of the efficient branches. Finally, TOPSIS was applied for ranking of the branches in order to verify the results.