This research intends to investigate the relationship between financial information transparency and investor behavior in TSE, in order to provide safety trade and improve performance of the financial market in Iran. In last decade transparency of the financial market has been known as one of the most effective variables in determining investor strategy. This study examines perception of transparency among investors in TSE. In the study used by questionnaire and for analyzing the data, SPSS software and the test of correlation, Independent Sample Test and One-Way ANOVA have been used. Results showed that three dimensionsi.e. transparency of ownership structure, information disclosure and transparency of board structure effect on investor behavior, however investors give more attention to the information disclosure. Also investor’s perception of transparency dimension considering demographic variables is different.