Abstract: The sympatric coexistence of plateau pika (Ochotona curzoniae)and daurian pika (O.daurica) was found by researchers，at Niannuosoma area of Gangcha county．Qinghai province (is located 37^。10' N．99^。40'E)．
This paper presented the relationship between the niches of two spesies of the pika in common habitat，from utilization of food resources．The experiment showed the niche breadth is 0.4744 for plateau pika and 0.4964 for daurian pika，respectively (PS measurement)，in the niche dimension of the food resources．The niche overlap was the largest(0.8091，FT measurement)in the niche dimension of food resources utilization spectrum between plateau pika and daurian pika．It was provable that he interference competition had been more intensity between two species of the pikas．

Key words: Plateau pika(Ochotona curzoniae), Daurian pika(O.daurica), Niche, Food resource spectrum, Food utilization spectra

摘要： 作者于1993年在青海省刚察县年诺索玛地区发现高原鼠免(Ochozoma curzoniae)和达乌尔鼠免(O.daurica)在布哈河谷二阶地同域且重叠分布之现象，并从这两种鼠免的食物资源利用出发，研究了其生态位关系问题。 在食物资源维上的生态位宽度(Ps)，高原鼠免为0.474 4，达乌尔鼠免为0.496 4，即它们具有相近似的生态位宽度。 这两种动物的生态位在食物资源谱维上的重叠值(FT)为0．809 1，表明它们在对食物资源的利用方面存在着激烈的竞争。

关键词: 高原鼠免, 达乌尔鼠免, 食物资源谱, 食物利用谱, 生态位