Abstract: Taking the pear orchard soil in Guizhou mountainous area as the research object, the effects of three grasses growing treatments, Dactylis glomerata,Vicia villosa and Trifolium repens on temperature, soil physical and chemical properties and soil bacterial diversity in the pear orchard were studied by using the orchard grass growing cultivation and management methods, in order to provide reference for the implementation of grass cultivation in local orchards.The results showed that the orchard grass cultivation could regulate the temperature of the topsoil, the ground and the lower space of the orchard.Compared with the control, the three grasses growing treatments improved soil nutrients, soil physical and chemical properties, changed the structure of soil bacterial community, and increased the abundance and diversity of bacterial community.The grass cultivation could improve the small ecological environment of pear orchard, and the improvement effect of leguminous forage was better than the forage grasses.