Introduction Election is Social and cultural phenomenon that it has political output finally and One of the main constituent elements of a democratic system and is an integral part of democracy. A Factor that play a decisive role in the outcome of the election, is the electoral behavior of citizens. Electoral behavior as a political action, rooted in the culture of the society and political culture of a society based on popular culture is emerging. One of the important variables in the culture of many countries, including Iran is ethnicity. North Khorasan Province especially Bojnoord, due to ethnic and cultural diversity is a famous cultural treasures and of ethnic groups (Kurds, Turkmen, Persian, Turkish and TAT) is formed and Ethnic groups have played a major role in its changes. This shows the importance of ethnicity as social capital in the fate of the region and political decisions. So Bojnoord as a multi-ethnic city is a good place to study voting behavior of different ethnic groups. This study, according to the importance of ethnicity and ethnic identity on electoral behavior is to identify the relationship between them. Material & Methods The study is based on elitist, social gaps, social identity, attachment of a group, rational choice, competition and internal colonialism theories. Field study method and technique questionnaire survey to collect the required data. The population of the study were residents Bojnoord of different ethnic groups such as Kurds, Turks, Turkmen, Persian, TAT, etc. that at the time of the Tenth Parliament were on the legal voting age (persons 19 years and older) According to the statistical population were 119 874. Cochran's sample size based on statistical formula at 95 percent with 5 percent sampling error and the heterogeneity of 0.60 to 0.40 was set equal to 367 people. Discussion of Results & Conclusions Electoral behavior of citizens was measured with ethnic voting pattern variable. The results showed that the average of voting pattern of ethnic variable is 34.7 (range 0 to 100). According to the results, 59.2 percent of respondents had a low ethnic voting pattern, 28.2% had moderate and 12.6 percent had a high ethnic voting pattern. The mean of ethnic identity of respondents is 58.6. Of the five dimensions of ethnic identity, the social dimension with an average of 87.8 and Cultural dimensions with an average of 79.6 have highest average respectively Also ethnocentrism with an average of 32.7 is the lowest average. The factor analysis revealed that self-labeling, cultural and social dimensions on a factor and the political and ethnocentrism dimensions are operating again. According to the results, 4.4 percent of respondents had a low ethnic identity, 49.9 percent of respondents had an average ethnic identity and 45.8 percent have been high ethnic identity. The relationship between dimensions of ethnic identity with the dependent variable showed that social, political and ethnocentrism has been positive and significant correlation with ethnic voting pattern. The findings show that in the multivariate regression model variables in the final model, ethnic identity and ethnic demands have a positive and significant relationship and feel the legitimacy of the political system has significant negative relationship with ethnic voting pattern. Compare the beta coefficient indicates that the ethnic demands have highest relationship with ethnic voting pattern. Examine the explanatory power of the model shows that the R2 coefficient model is 0.31, in the other words independent variables could explain 31 percent of variance of ethnic voting pattern. Also study the model with structural equation modeling showed that sense of social inequality, media consumption, social satisfaction and a sense of legitimacy of the political system with the interaction with other ethnic groups, through the impact on the formation of ethnic identity and ethnic demands effect on ethnic voting pattern.