The data matrix of macro and trace elements from 45 samples of traditional Chinese medicine Xixin were treated with principal component analysis and cluster analysis in order to establish why and how Xixin samples from different species can be recognized. According to the results of hierarchical clustering, three species of Xixin (Asarum heterotropoides Fr. var. mandshuricum (Maim.) Kitag., Asarum sieboldii Miq. var. seoulense Nakai and Asarum sieboldii Miq.) were classified and recognized accurately.