Data correlation from Chinese, Кidan and ancient Turks sources about the unusual phenomena occured in the Central and East Asia in an Early Middle Ages

In this article are compared and the items of information Chinese, Kidan and Ancient Turkic written sources on history of Turkic and Mongolian nomadic peoples of the Central Asia are analyzed, in which we can find information about unusual natural phenomena with negative consequences on economic activities in nomadic society. Among these investigated events emphasizes those, which became consequence of anthropogenous influences on inhabitancy. The meaning of similar events for mutual relation of the nomadic and settled-agricultural countries of East Asia in an Early Middle Ages is estimated.