The State includes of the independent political-geographical determinants that they are the most important division of the present world and this matter at first, is created in Iran and in Achaemenian period. The Main factor or factors are Reasons d'être and Survival of State that they are important for appearance and continuation of state. Iran is a historic state that civilization and establishment of that has been passing several centuries. Some scholars and experts have expressed some opinions about the foundations of national identity, Reasons d'être and Survival of Iran. Each of the research has been focused on a factor or some factors of Iranian national identity according to the specialty and interesting field of scholars. The main question of this research is, what are the Reasons of d'être and Survival of Iran? And do these factors have the same share? Description-analytic method has been used in this research and the results of the survey show that Iran has several main Reasons d'être and Survival.