In this study, we have demonstrated that differences in the attitude, behavior and fertility level of ethnic groups are the reaction of their different position in the educational system caused by unequal development. Findings show that there are deep educational inequality, sex imbalance in literacy and level of education, with higher intensity among Kurd ethnic group, and significant differences in the attitudes, behavior and fertility level among ethnic group. Yet, after controlling the effect of independent variables, ethnic differences in fertility declined from 2 children into 0.57 children. In general, 39.3% of ethnic groups fertility variance are explained by the variables studied. Because of high level of educational inequality, attitudes and fertility ideals are also different and support high and low fertility Among Kurds and Turks respectively. These different attitudes caused different demographic functions and continuation of this situation will cause demographic divergency become the predominant in surveyed society.