The immigration phenomenon in Iran, like other immigrant host countries, is a two dimensional phenomenon and alongside the creation of an opportunity in cultural, economic and social exchanges, problems such as population imbalance, rise in unemployment and appearance of insecurity also come about. From 1979 to-date, the Islamic Republic of Iran has practically constantly been host to 2 million to foreigners including immigrants and refugees and at times the number has reached to more than 4 million, most of whom are from Afghanistan, therefore the aim of this research is the study of the positive aspects and challenges of their presence in the social, economic and cultural spheres and particularly its effects on national security following...