Abstract: The Qianning Ancient Ice Cap was discovered in 1982 by author. It was formed on the peneplain of Daxueshan Mountain, which belonged to the second ice epoch counted backwards in the Pleistocene. The ice cap is located in the eastest and lowest part of Qinghai-Xizhang Plateau. The height is only 4300-4400 meters above sea-level and the geography coordinate is 101?14'-101?30E and 30?20'-30?38'N. Therefore, this is a special enveronment in the whole plateau. It has the special feature that there is short of ice erosion remains in the central region of the ice cap and there are lot of the landforms of erosion and deposition in outside of the ice cap, for example the glacial valleies and glacial lakes. Way? Because the ice layer of the center of the ice cap was too thin so that there was no enough power to erosion, and where was thick in the outside and the erosion power was strong. Therefore, it is a new type of ice cap in the Qinghai-Xizhang Plateau or in the world even. It's discovery has an important value to study Quaternary glacier of the Qinghai-Xizhang Plateau.