This article discusses Stochastic Data Envelopment Analysis (SDEA) models plus selecting and useing an appropriate model in order to forecast the future efficiency of Iranian Mellat Bank branches of Qazvin province in the financial year 1382 (2003-2004). in order to determin the validity of the results of model utilization , actual efficiencies are compared with forecasted efficiencies of branches in the mentioned period. Finally, the results and benefits of using Stochastic Data Envelopment Analysis used for improving management decisions are further discussed.