中文摘要：

台语支的语言分类是一个长期争论的问题。本文以大样本的同源语素作为分类特征，对其进行量化计算后，构建了台语支邻接树和系统发生图。本文还借助代表点的特征差异度来揭示台语支语言的变化（传播）方向，移民史、分子人类学等研究成果为我们的结论提供了佐证。

英文摘要：

This paper presents the neighbor-joining tree and phylogram of the Tai languages by quantizing and computing the large sample of cognates. The results support the bipartite division of Iai languages proposed by the French linguist Haudricourt. This study illustrates the direction of change occurred to the Tai languages through analyzing the feature differences among the ＂lhi languages as well. The conclusion is compatible with evidence from the history of population migration and findings of molecular anthropology.