Abstract:Grass/Trifolium repens grassland is one of the main pastures for grazing and hay harvesting in the karst areas of southern China.Clarifying the characteristics of individual,population and community of plant,and soil nutrients of degraded grass/Trifolium repens grassland will provide scientific basis for its classification.The Lolium perenne tillers,T.repens stolons,community characteristics,biomass composition,soil-herbage chemical characteristics and community stability of degraded grassland (DG) and un-degraded grassland (CK) were quantitatively measured.The results showed that 1) Height,coverage and aboveground biomass of plant community,and tiller density and tiller weight of L.perenne were CK＞ DG,while the density and weight of ereT.repensere stolons were similar between CK and DG.2) The aboveground biomass composition of the sown grass (L.perenneere+Dactylis glomerataere) was CK(83.750%±2.067%)＞DG(55.100%±4.593%),while for the forbs and L.perenne,it was CK＞DG.3)The pH,organic matter and total P in 0~10 cm soil layer were CK＞DG.The species Raunkiaer frequency histogram of CK was inversely J-type,which was relatively stable,while the community succession value was CK(42.25±3.43)＜DG (53.27±3.64),CK was in a higher succession stage.L.perenne tillers,biomass composition of sown grass and T.repens,and soil pH could be used as the basis for classification of graded grass/Trifolium repens grassland.