Abstract: The relativefatnessof greater long-tailed hamster (Cricetulustrion)was ealculated by the formula K=l00/^_L3.where K _^represets the relative fatness, W the body weight in gram, L the length of head and body in cm．Statistical results show that the relative fatness of females was higher than that of males．The relative fatness were becoming lesser as the age was gtowing up．The relative fatness didn't chanceevidently in different crop fields． but it didn't changed evidently in different seasons，which was mainly influenced by climatesand reproductions．Statistical reaults also show that there was not ponding relation between the relative fatness an d the popoulation density.

Key words: Greater long-tailed hamster(Cricetulus triton), relative fatness, seasonal changes

摘要： 本文依公式K=100W／L³计算了大仓鼠肥满度。统计结果表明，雌性肥满度大于雄性肥满度。肥满度随年龄增长而减小。不同作物类型样地中大仓鼠的肥满度变化不明显。不同季节肥满度有一定的变化，主要与繁殖和气侯有关。肥满度与种群密度之间不存在明显的对应关系。

关键词: 大仓鼠, 肥满度 , 季节变化