Knowledge in our modern world is regarded as a vital tool for the maintenance and progress of the organization. That is, in today’s competitive world, lacking the necessary knowledge won’t guarantee the organization success. In the present article,theeffect of creating knowledge was studied based onfour-stage model by Nonaka&Takeuchi in gaining competitive advantage the six-element model presented by Mintzberg (Quality-Design-Indiscriminacy-Price-Logistics-Image) and surveyed in different branches of KarAfarin Bank in Tehran. In This research, following experts’ idea, the plan Questionnaires was provided including two sections. The first part of which were in search of evaluating creating knowledge indexes and the second part tried to evaluate the competitive status as presented Mintzberg’s six-element of competitive advantage, were prepared .These questionnaires were distributed among 185 members of managers and the experts. After that, the necessary statistical analyses were carried out and the hypothesis of the existence of positive and meaningful effect  in creating knowledge in obtaining competitive advantage quadruple dimensions of sociality , externalizing , combining and internalizing were confirmed and ascertained that back