Climate change is already and will continue to impact on our natural ecosystems and human society extensively and profoundly,and therefore will be the risk of human economic and social development.Temporal and spatial dynamic characteristicsof grassland ecosystem service value from 1971 to 2000 as a baseline period and from 2021 to 2050 under RCP 4.5(middle and low emissions) and RCP 8.5(high emission) scenarios in China were analyzed,in order to understand spatio-temporal dynamic pattern and reveal the impact of climate change in the future. The calculation methods put forward by Costanza,etc. and the NPP data calculated by using the CEVSA ecological processes model were used. The results showed that the total grassland ecosystem service values showed an increasing trend,with the annual mean of 1.93*10~(12),2.26*10~(12) and 2.27*10~(12) yuan,respectively for baseline period and for future(under RCP 4.5 and RCP 8.5 scenarios). Total value displayed a space pattern of gradualincreasing from northwest to southeast,which was consistent with the distribution pattern of hydrothermal conditions. The values decreased in relatively little areas i.e.,in the west and north of Tibet and the middle of Xinjiang,but increased in other regions in the future,relative to the baseline period. A patter of greater increase amplitude in the southeast and smallerones in the northwest was observed,which was similar to the Hu Huanyong line population distribution pattern in China. The increase percentage was within 30% in most of areas,was in the range of 30%~60% in a few regions,and was more than 60% in very few regions. The contribution rates of ecosystem service value for individual function were in an order of soil formation and protection(26.9%)>waste treatment(18.1%)>biodiversity protection(15.1%)>climate regulation(12.4%)>gas regulation=water conservation(11.0%)>food production(4.1%)>raw material production(0.7%)>recreation and culture(0.6%). Therefore,material products accounted for only 4.8% of the values,and intangible value accounted for 95.2%. This study revealed a dynamic evolution pattern of grassland ecosystem service values in the future and its corresponding response to climate change in China. It has some guiding significance for adapting to climate change,utilizing forest resources rationally,and strengthening ecological environment construction. To a certain extent,it fills the blank of the dynamic and quantitative prediction of ecosystem service value in China at present.