Abstract: The cause-formation of tectonic-glaciation of Hanas lake and the change of the lake in late of Quaternary is discussed.The existence of a larger ancient lake is demonstrated.The environmental change around the lake is proved as：the climate was warm and humid in early Pleistocene, in middle Pleistocene, the climate became cold, large area of glaciers began todevelop in the mountains.After then, the glaciers retreated continuely, which means that the climate became dry gradually.The new proof of dividing of the glacial epoch and the new division of six glacial epoches in Hanas river basin is given.