Through analyzing statistically metrological observation data from 1971 to 2010 and pasture data from 1983 to 2012 at 6 animal husbandry meteorological testing stations of Inner Mongolia grassland,the conclusions were drawn. Those were that annual average temperature rose in a straight line in Inner Mongolia grassland,and the increase rates of annual average temperature in meadow steppe and typical steppe were 0. 40 and0. 34 ℃ /10 a respectively. Annual rainfall had 10-year cyclical characteristics,and precipitation in the 1990s was the most but reduced significantly after 2000. Climate experienced the cold wet- cold dry- warm wet- warm dry periods. Warm and dry climate made the average heights of pasture in meadow steppe and typical steppe of Inner Mongolia cut down 2. 4 and 9. 3 cm in nearly 12 years than that in the 1990s; the average coverage of herbage decreased by 11% and 13%; the average hay yields reduced by 1 019. 8 and 671. 4 kg /hm2. Through analysis statistically metrological observation data from 1971 to 2010 and pasture data from 1983 to 2012 at 6 animal husbandry meteorological testing stations of Inner Mongolia grassland, the sentences were drawn. Those were that average temperature rose in a straight line in Inner Mongolia grassland, and the increase rates of annual average temperature in meadow steppe and typical steppe were 0. 40 and 0. 34 ° C / 10 a respectively. Annual rainfall had 10-year cyclical characteristics, and precipitation in the 1990s was the most but reduced significantly after 2000. Climate experienced the cold wet- cold dry- warm wet- warm dry periods. Warm and dry climate made the average heights of pasture in meadow steppe and typical steppe of Inner Mongolia cut down 2. 4 and 9. 3 cm in nearly 12 years than that in the 1990s; the average coverage of herbage decreased by 11% and 13%; the average hay yields reduced by 1 019. 8 and 671. 4 kg / hm2.