The intensive research on impact of climate change on grassland vegetation has significance on cognizing scientifically and utilizing reasonably grassland resource. In this research,taking aboveground biomasses of five herbs and six meteorological factors as research subject,selecting typical steppe as research area in Xilin gol league,Inner Mongolia, taking the grey relational dominance analysis as a research tool,the grey relational matrix of herbs aboveground biomass and meteorological factors was established. The result of dominance analysis showed that the descending order of the influence degrees of six meteorological factors on aboveground biomasses of 5 herbs was relative humidity,precipitation,evaporation,soil temperature,air temperature,and sunshine hours. The responsive sensitive degrees of the aboveground biomasses of 5 herbs on six meteorological factors from large to small as follows: Stipa grandis,Leymus chinensis,Carex korshinskyi,Agropyro michnoi,Artemisia frigida. The conclusions were that the impact of moisture on aboveground biomass was heavier than temperature; the sensitivity of Stipa grandis and Leymus chinensis to meteorological factors was larger than that of Artemisia frigida.