The Qinghai-Tibetan plateau is the biggest present glacial distribution region in the world.Except for glacier stability or advancing from the beginning of 20 century to 1930s and from 1970s to 1980s,the tendency of the glacier fluctuations is retreating in the last 100 years. Glacier fluctuations is well relevant to climate change in the past 100 years,though glacier fluctuations is delayed in reacting climate change. For most glaciers,the delayed time is 10～20 years.According to the values of the average net mass balance in glaciers since 1980′s,there are three regions over the Qinghai-Tibetan plateau:the balance or positive-balance,negative-balance and strong negative-balance regions are located in the inland Plateau,from inland to the edge of the plateau and the edge of plateau,respectively. By the hysteresis effect of
glacier fluctuations responding to climate change,the authors forecast that glaciers will retreat in the edge of the plateau, and stable in the inland plateau in the next 10～20 years.