According to the Y chromosome 12 kind of monomers double allele frequency data,the paper utilizes the principal components analysis and Rough-set Theory to classify in 13 kind of nationalities crowds the northeast area.

• 运用主成分分析、聚类分析和粗糙集理论；依据Y染色体的12种单体型的双等位基因频率数据；对东北地区13种民族人群进行分类.