Details cultural structure of regional governments in the Parthian period as part of the development of the Kingdom, except the body of their kingdom is rarely considered. One of effective government (in some respects) in Parthian kingdom is Elimaiid in southwestern Iran that studied from some approach. Elimaiids religion is a very important subject that some of researchers consider on. Views on this issue are very diverse and sometimes contradictory. In this article, at first we assess and proposed geographical location of Elymais and then for present research problem and different viewpoint proposed about Elimaiid’s religion bring the subject and the background studies. Studied some of Elimaiid’s reliefs and new archaeological evidence mainly that have more relation with religion and in the end, analyzed these documents and in result we evaluated the possible spread of the Zoroastrian religion in some parts of the Elimaiid’s land at the end of the Parthian period.