Restoration and maintaining peace, justice and democracy in the human societies is a matter that it`s achievement is too difficult due to economic and social gaps. 
It is obvious that these social and ethnical gaps increases those difficulties and it is natural that mechanisms and rules relating to establishing peace and justice and Democracy in the multiethnic societies  is too different in comparison to homogenous societies. 
There are some studies showing the statistics of domestic war and tensions are more than inter-state wars. Third-fourth of all tensions and wars are allocated to domestic wars in 2013.International community, therefore, must attention to these tensions in the within of states. Most of these tensions and wars are allocated to multiethnic societies. 
In this article, attempts to settlement of these problems in the multiethnic societies have been studied for establishing peace and justice in these societies. The hypothesis of the author is that consociational democracy is the best possible and ideal system for the deeply divided multiethnic societies. 
The survey on the Iraq and Bosnia ( in the two different continent ) is for the test of this  hypothesis