Abstract: The characteristics of climatic variation and its impact on plant climate productivity were studied with the observed data of 6 meteorological stations from 1961 to 2014 in the steppe of Chifeng. The results showed that annual average temperature increased significantly in 56 years, and the annual precipitation was slightly decreased. The forage grass climate productivity in the steppe of 6 counties were slightly decreased, and the means of climate productivity was 6 992.88 kg/hm2·a, and the rate of decrease was 1.956 3 kg/ hm2·a. The regional distribution of forage grass climate productivity in north of the steppe was better than in south, the rate of change were from-13.38 to 2.63. For two meteorological factors, annual precipitation was very significantly positive correlated with climate productivity, and annual average temperature was significantly negative correlated with climate productivity, which implied the natural precipitation was important meteorological factor in determining climate productivity in steppe of Chifeng.