中文摘要：

借助DNA序列中k-字的频数，将序列转化成一个340维向量，进而计算物种间的进化距离。作为应用：分别以15个物种的β球蛋白基因、13种汉坦病毒的S片段以及26个闭壳龟线粒体基因为例，构建系统发生树，所得结果与前人的结论一致，说明了该方法的有效性。

英文摘要：

By means of the frequencies of k-words, the DNA sequence is transformed into a 340-D vector, and then the evolutional distance is obtained. The proposed measure is used to construct phylogenetic trees on three separate sets ： the full β-globin genes of 15 species, the S segments of 13 hantaviruses and 26 Cuora mitochodriona genes. The results are consistent with those of previous analyses, which illustrates the utility of the approach.