In order to understand the herbage biodiversity and synusia structure of artificial forest,we investigated herbages under five forest types of Populus simonii(PS),Prunus armeniaca(PA),Prunus davidiana(PD),Hippophae reamnoides(HR) and Caragana korshinskii(CK).In the 37 herbaceous species identified,only 18,25,20,25 and 17species were present in the PS,PA,PD,HR and CK forests,respectively.For herbages,Stipa bungeana,Arthraxon hispidus,Potentilla multifida and Thymus mongolicus were common in the five plantations.The average coverage,height and biomass of herbages in five artificial forests were different obviously,but community biodiversity was similar.In conclusion,low biodiversity and limited structure development(coverage,height,biomass) under five artificial forests indicate that the environments under artificial plantations are very bad and affect herbage individual development and community structure.Results show that the best herbage community has developed under the Prunus armeniaca forest with a relatively open canopy and low tree density,which suggests that the measures of tree thinning and canopy pruning to keep reasonable density are crucial for promoting artificial forest development,and improving herbage biodiversity and community structure.