Based on data obtained from 57 plots of grassland community and 47 plant species in Yun Wu Mountain grassland, the ordination method CCA is used to analyze the relationship between plant community types, species distribution pattern and environment factors. Enclosing is a dominant factor for affecting species distribution and community type. The enclosed grassland is Stipa bungeana community, dominated by Stipa bungeana, Thymus mongolicus, Stipa grandis, Androsace erecta, and Heteropappus altaicus. In contrast, the unenclosed one is Artemisia sacrorum community, dominated by Artemisia sacrorum, Poa sphondylodes, and Potentilla acaulis. In addition, the soil water of 20-100cm depth has an important influence on species distribution. Nutriention,, especially the soluble-K and NO-3-N, affects the species distribution too. Topographic attributes, such as elevation, slope position, aspect, slope, have no significant impacts on plant distribution.