Abstract: Based on field investigations and laboratory analysis of samples, through studing on the aeolian sand deposits.paleoperiglacial phenomena, relics of Quaternary glaciation, evolution of lakes, sporepollen analysis, paleosol and so on, the changes of natural environment in the eastern Qinghai Plateau during the past 30, 000 years are divided into eight stages in this paper: early period of full Last Glaciation（30, 000-23, 000 a.B.P）full Last Glaciation（23, 000-14, 000 a. B.P）, Late Glaciation（14, 000-12, 000 a.B.P ）, warm period in early Holocene（12, 000-8, 500 a.B.P）, colk period in early Holocen（ 8, 500-7, 000 a.B.P）, Climatic Optimum in middle Holocene（7, 000-3, 500 a B.P）, Neoglaciation in middle Holocene（3, 500－2, 500a.B.P）, tempe－ rate period in late Holocene（after 2.500 a.B.P）Annuac average temperatures Tin every stage are estimated.