Abstract: Twenty-eight species of hamster family (Cricetidae)in Inner M ongolia region were taken as OTUs.The total character number was 46，includlng 26 items of two states character，7 items of unordinal multistate character，and 1 3 items of quantitative character．Based on 4 strategies of hierarchical clustering analysis and principal component analysis(PCA )，numerical taxonomy of these sinail mammals was carried on．As one result of these analyses the musk rat (Ondatra zibethica)was divided from the meadow mouse subfamily (Microtinea)as a single subfamily．The classifications of the remained species were the samle as those of traditional classifications．
The result of the UPGM A clustering was the best in all clustering methods. The results of PCA in three-dimension ordination graph were consistent to those of clustering analyses．The PCA method also showed the characters distribution in three-dimension ordination graph.The initail 15 characters with more factor loading in first 19-dimension
principal components were gotten as main basis for classification to estahlish the keys for the studied animals．

Key words: Hamster Family, Numerical Taxonom y, keys, musk rat (Ondatra zibethica)

摘要： 以内蒙古地区28种仓鼠科动物为分类单位，以形态特征为主兼顾头骨结构、牙齿构造和生活方式，列出46项特征，用系统聚类分析和主分量析，对这些动物进行数值分类。结果表明，麝鼠以其特异性特征从田鼠亚科中分离出来，单独构成一个亚科，其余各种的分类结果与传统分类处理结果一致。系统聚类分析以不加权的对群成聚的算术平均法(UPGMA)得出的分类结果最好，主分量分析同时得出各项特征在前三维主分量上的分布图，并根据特征在前19维主分量上的累计贡献率大小，选取15个特征构成对所研究动物的数值分类检索表。

关键词: 仓鼠科, 数值分类, 麝鼠, 检索表