Abstarct: Marketing approaches have been changed to strategic approaches with long-term horizon, since mid 1950s. Tendency of business institutes was focused on precise consideration of customer and consumer needs. The concept of marketing was changed to the philosophy enforcing on business enterprises and term of “market orientation” was used for execution of marketing concept. During last decade, market orientation has been considered by marketing researchers intensively and raised as one of main subjects for research in the strategic marketing. Market orientation and its effect on the performance were focused as the important and pivotal topics in market and customer management. In this study, we examine the effect of market orientation on the Maskan Bank performance in Tehran, considering antecedent and environmental factors. For this purpose, 65 branches of Maskan Bank of Tehran were selected as sample and a prepared questionnaire was provided to the branch manager and deputy. To analyze the hypotheses, logistic and linear regression was used. Summary of study indicated that the market orientation is effective on the Maskan Bank performance. But out of antecedent factors, senior managers, and interaction between departments out of dynamism between organization sections, and reward system out of organizational system factor improve the Maskan Bank market orientation. But, conflict between organization sections, official system and centralization factors have no effect on the market orientation. Also, statistical analyses indicated that environmental factors have no effect on the relationship between market orientation and performance.