The Kurds are a group of Arian tribes and races who immigrated to Iran Platu, along with other Arian groups, and settled down in certain areas in modern countries such as Iran, Iraq, Turkey, Syria, Azarbyjan, and Armenistan.Although their settlement was largely in the above-mentioned districts, some smaller groups, due to their manners of living and earning their livelihood based upon economy and Cattle raising, and sometimes because of the cultural, political, and social reasons, were scattered in various areas of Asia , including estern Iran, during various centuries.There is no exact information available of the cause and date of their scattering in eastern Iran before the Safavid period.There is only certain sources available to mention their living in Khorassan in the early Islamic centuries, while other sources refer to their presence during the Taimorids and the early years of the Safavid era.However, the real movement of Kurds and their immigration to Khorassan began during the Shah Abbas reign and continued till the Nadir Shah rule.In this article an attempt is made to study the causes and reasons of this, more or less, compulsory immigration and how it happened while identifying some of its consequences.