In the post -Westphaliaera, there are few unitary countries without any diversity, so new states are going to investing and providing strategy for establishing and improving the national coherency. If national diversity and heterogeneous mainly contains religious, ethnic, linguistic and cultural dimensions, so Iranian society would be as diverse as possible. As a matter of fact, it could be varieties in diversity of Iranian society in the whole dimension of the phenomena. Here the paper is trying to processing and analyzing this phenomenon and making recommendation for maintenance and evolving national coherency by focus on ethnics in Iranian society. The reason is that ethnicity and ethnic differentiation is the strong force in contrast of modernity in the national level and could be make domestic violence and providing opportunity for influencing of revival countries of Iran in the proximately region.
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