According to historical documents, Ardašīr-Xwarrah or Firoozabad is one of the first cities to be built by Ardeshir I, the founder of the Sassanid dynasty, based on accurate geometric and perfectly circular calculations. This research seeks to answer the question of where was the origin of Sasan and what ideas caused Ardeshir to circle the city of Ardašīr-Xwarrah and what were the significant effects and organ function of this city and on what concepts were they located? The research method is descriptive-analytical. Historical documents show that Sasan was probably a descendant of the Achaemenids; After several generations of living in the eastern regions of Iran (probably India or Arachozia), he returns to the land of his ancestors (Persia). On the other hand, available sources report that Babak was also aware of astronomy and astrology and was known for this knowledge. The acquaintance of these two important personalities in the family of the founder of the Sassanid dynasty, has caused the city of Ardašīr-Xwarrah to be built with the concept of the city of Shah-God and a symbol of Avestaian cosmology, based on Vedic knowledge and Vastu Purusha Mandala. In other words, Ardašīr-Xwarrah is a Vedic-Avestaian model and its located landmark works indicate the ancient Avestaian concepts and ideas that have been discussed in this article.concept of the city of Shah-God and a symbol of Avestaian cosmology, based on Vedic knowledge and Vastu Purusha Mandala. In other words, Ardašīr-Xwarrah is a Vedic-Avestaian model and its located landmark works indicate the ancient Avestaian concepts and ideas that have been discussed in this article.