Activities of plateau pikas（Ochotona curzoniae）affect physiological properties of different plant in alpine meadow communities by foraging. A controled experiment was conducted to determine the effects of disturbance by plateau pikas on physiological properties of legume and Elymus nutans from 2010 to 2012 in Guoluo, Qinghai province. The results showed that（1）There were no significance differences among the treatments in May and June: the aboveground biomass, plant height, tillers number, tillers length, canopy coverage all decreased, but the lengths and the number of Elymus nutans leafs all increased initially, and then decreased with increased disturbance levels by plateau pika foraging in July and August.（2）The increasing range of plants which were preferred by plateau pikas in control（CK）was significantly higher than that in high density areas（HD）(P<0.05). Plateau pika foraging intensity showed a negative correlation during legume late growth stage. The foraging intensity in the low or medium densities is favorable to Elymus nutans leaf growth, but greater feeding intensity is unfavorable to its growth.（ii）Higher plateau pika foraging intensity has obvious inhibitory effects on the increasing range of plants which were preferred by plateau pikas.