Abstract: Homerange size ,core area size，overlaps of home range and core area individuals in same family, exploring and dispersal distances are important information for studying dispersal .They were studied with telemetry in 1995，and found home range size of pika from 3138m² to 17 062m²．and cores area from 1292m² to 7808m² .Overleap size of home range between femes is smaller than that between female and male .Both dispersed and exploring distances could reach about 200 m .Daurian pika became obviously more active after August，exploring and dispersal activities were found in September．They might regroup in the autumn to cover winter.

Key words: Daurian pika(Ochotona daurica), Dispersal, Telemetry, Home range, Exploring

摘要： 达乌尔鼠兔是内蒙古草原斑块分布的一种害鼠。它们在斑块间的扩散对其种群调节和进化都有重要意义。文章对两个家族的达乌尔鼠兔进行了无线电遥测研究。它们的巢区面积从3138M²到17062M²,核心区面积从1292M²到7808M²。雄性—雌性巢区重叠面积比雌性—雌性巢区重叠面积大。该鼠的扩散和探索距离可达 200m.从9月开始鼠兔的活动就很活跃，尤其是探索活动和扩散。多数扩散个体在移居点很快消失。

关键词: 达乌尔鼠兔, 扩散, 无线电遥测, 巢区, 探索