The increase of available burrow density of plateau pika (Ochotona curzoniae) affects place or function of different plant in alpine meadow communities. A field survey was carried out to determine the effect of available burrow densities of plateau pika on plant niche characteristics of alpine meadow communities in the Qinghai-Tibet Plateau. This study showed that the number of present plant species increased and the more unpalatable plants were identified as the available burrow density of plateau pika increased. The legume plants were found as the available burrow density was over 15 per 625m². With the increase of the available burrow density, the important value of Kobresia pygmaea, dominant plant, firstly increased and then decreased, peaking at 15 per 625m² available burrow density. The niche breadth of K. pygmaea was the biggest among all plant populations of alpine meadow communities when the available burrow density was or below 21 per 625m², but it became the tie for third and was lower than that of Euphrasia pectinata and Anemone obtusiloba, and equated to the niche breadth of A. rivularis and Euphorbia esula when the available burrow density was 31 per 625m². The plants with the biggest niche overlap with K. pygmaea were P. fragarioides, Ajuga ovalifolia, E. esula, Cremanthodium lineare, at 10, 15, 21, 31 per 625m² available burrow density respectively. The K. pygmaea was one of two populations which had the biggest coefficient of niche overlap at 10 per 625m². However, K. pygmaea was not involved in the populations which had the biggest coefficient of niche overlaps when the available burrow density was or over 15 per 625m².These results suggested that the increase of available burrow density of plateau pika changed the important value, niche breadth and niche overlap of different plant population in alpine meadow communities.