The spatial organization of cities during the Sassanid period includes three parts called Kohandezh, Shārestan, and Rabaz that the important political, religious and social sectors were located in Kohandezh. In the Islamic period, although the organization of urban space, has the same three parts of Kohandezh, Shārestan and Rabaz like the ancient era, according to historical texts, during this period the power of Kohandezh diminished due to some reasons, and Rabaz and Shārestan became the political, religious, economic and social center of the city. The purpose of the present research is to recognize the historical texture of Rey during the Seljuk period by spatial organization of the city and social level changes based on historical texts and archaeological data. Accordingly, some important questions are raised here: What is the role of Kohandezh, Rabaz, and Shārestan in the organization of urban space during the Seljuk period of Rey? How did this structure differ from the previous periods? As a result, it was revealed that the historical texture of Rey during the Seljuk period took a new form compared to the urbanization style of the previous eras. Archaeological data indicate that during the early Islamic era, especially the Seljuk period, the Rabaz and Shārestan sections boomed and expanded.