There are five remained reliefs from the reign of Ardashir I (224-240), the first Sasanian emperor, in Iran, which are located in four different sites: Naqsh-i Rajab, Naqsh-i Rostam, Tangab, and Salmas. In this article, the author will try to examine some problems in these reliefs' dating, according to several methods, such as surveying the details of the clothes and he addresses, the styles of the personages' hairs and beards, etc.