Abstract: Studying performance of banks is used for rating work units to allocate operational funds. The main objective of this study is to calculate the performance of Bank Saderat of Iran and in particular, branches in Tehran using Shannon Entropy Weighting Technique and ranking the branches based on TOPSIS Model. In this research, we have attempted to calculate the performance of seven excellent branches in Tehran using TOPSIS technique. The considered data in this study include operational resources (Rial, foreign exchange), operational consumption (profitability), incomes, banking services, transactions and performance evaluation criteria of the branches. The results indicate that in evaluating and ranking banks, measures of operating resources and operating expenses had the highest weights and they were considered to evaluate final performance and rating the excellent branches as indicators.