During the sixth century (hijri), Alavi Sādāt, who had settled in Transoxiana , played a considerable role in political – social developments of that region, especially in the predominance of the Qara khitay on there, which has been neglected till now as a result of the silence of historical sources on this issue, but In spite of scantiness of historical data, the active existance of Alavi Sādāt in the context of politics and society of Transoxiana during sixth century (hijri) is traceble and it could be studied. The aim of this paper is to give more clarity to the activities of Sādāt and their role in the political developments of Transoxiana in the sixth century by applying descriptive analytical method. The results of this research show that the strong social base of Sādāt in the region, has provided an opportunity for them to proper the context for the dominance of the Qara khitay in the region while quarreling with Qarakhanids' power. Following those matters and apparantly with the intention to establish an independent Alavi government, they bagan to encounter with Qarakhitay’s supermacy, and brought into being some of impressive social and political evevnts in that region.