Abstract: Under the background of global change, climate resources have also changed correspondingly. There are different kinds of grassland and typical agro pasture ecotone in Inner Mongolia, which are vulnerable to climate changes. The research on the climate resources change is essential to the adaptation to climate change. Based on mean daily temperature, mean annual temperature, and annual precipitation from 1961 to 2005,〖JP+1〗 the Moist Index was analyzed to discuss the change of climate resources in Inner Mongolia. Based on the analysis, we draw the conclusion that mean annual temperature had increased and accumulated temperature(T≥0℃) showed a significant rising trend in the past 45 years. The change of precipitation had presented a regional difference, which was increased in east and north east, while decreased in western Inner Mongolia. The area of desert, semi desert and meadow steppe increased, while the area of forest steppe was decreased. Under the background of climate change, the prolonged growing season had brought opportunities to agriculture and forestry production of the eastern Inner Mongolia, while desertification and vulnerability of grassland had got more severe than before, which had bad effects on production and living in Inner Mongolia.

Key words: Climate Change, Inner Mongolia, Climate Resources, Moist Index