This study aims to investigate the efficiency of Tejarat Bank information systems and the extent to which bank managers apply these systems. Today's condition of trading and competitive atmosphere and the evolution in financial and banking systems of countries has highlighted the need for a comprehensive and responsive evolution to satisfy the society's needs in any developing and sustainable economy. Hypotheses have been formulated to assess and evaluate the present systems from various dimensions. This study was carried out in all branches of Tejarat Bank in Kerman Province in 2014. Data was collected through questionnaire and field study. Data analysis have been done through statistical tests. Findings showed that Tejarat Bank accounting information system has great potentiality and efficiency in providing the bank managers with adequate information. On the other side, the bank mangers made the least use of the information presented by these systems.