In the centuries after Islam, Great Khorasan has been among the most influential regions on the Islamic culture of Iran in different aspects. The development type of the cities of this region in the third to the seventh centuries is one of the examples. The most striking feature of the cities of Khorasan in this period is the further expansion of the most cities built before Islam. In addition to maintaining their before Islam basic elements, they were adjusted with the development model implemented in the Islamic period and spread based on it. This study demonstrated that the pattern of urban development in this period was often based on the teachings of Islam and was proposed by the jurists to the rulers. The instances were paying attention to the issue of water existence, building the central mosque, establishing the market and maintaining the security of the citizens. This study used a descriptive, comparative and analytical approach to investigate the issue. The findings were based on library research, a survey of the Ibn al-Rabi’s opinions, a jurist of the third century (AH), and taking advantage of the evidence of geographical history of great Khorasan and the books of geographers.