Cities are essential feature either in Khorasan or the rest of the world. City has its special importance; it reflects the significance of the state, or the region, and its activities, and it shows the increase and the decrease of the inhabitants. Nishapur is one of those cities that mirror the significance and the development of Khorasan region. The Khorasanian cities since their foundation by the Sasanian emperor Sabor1 Ibn Ardeshir Paykan in the 3rd century AH, took their first position in the old Silk Road, which connected the trade between China, India, and Arabic countries with Europe over the Mediterranean coasts. The goal was to build a strong city protecting the core of the Sasanian Kingdom against the ambitious tribes that settled down in medial Asia. Nishapur really played that role for a long time. Islam came to it too late, because of its long-distance, and it is unlike other Parisian cities which located under the firm control by Umayyads, as a result of that, Abbasids exploited it as a remote base to build their power.