The response and adaptation of plant community characteristics and functional traits to different types and intensities of disturbance under the background of climate change are the hot topics of vegetation ecology. A field survey was carried out to study the community characteristics (community structure and species diversity) and functional traits of subalpine meadow steppe communities in piedmont alluvial fan at the valley of Xincang village,Dazi County at a dry-warm valley of the Lhasa River Basin. The effects of different intensities of disturbance in the case of grazing excluded all the year round, grazing excluded only during warm months and grazed all the year round on community characteristics (community structure and species diversity) and functional traits were investigated. Community height,aboveground biomass and dead standing materials decreased significantly with increasing the intensities of the disturbance,while community coverage had no significant changes. Excluded the disturbance intensity differences,the species diversity had no relevance with the functional traits of plant height and palatability. Diversity of all species and the palatability were no significantly correlated with disturbance intensity, reflected by the species richness,diversity index,and evenness index. However, functional traits of plant height, palatability decreased significantly with increasing the intensities of the disturbance. The effects of disturbance intensities on functional traits were more significant than species diversity. The inner link of species diversity, functional traits and ecosystem function as well as the response time and models of the three to the different intensities of disturbance should be more widely discussed in further studies.