在语义学领域里对语言理据的研究已经有很长的历史了。通过对语言理据的探讨来解释“Watergate”类比构词形成的一系列词汇的语义理据,揭示转喻在这一现象产生中起到的重要作用,指出正确运用语义理据,构建学生心理词汇中的语义网络,能够促进词汇教学。 In the field of semantics on the language of research has a long history. This paper explains the semantic motivation of a series of lexicon formed by analogy of “Watergate ” by discussing the motivation of language and reveals the important role that metonymy plays in this phenomenon. It points out that the proper use of semantic motivation and the construction of student psychology vocabulary In the semantic network, can promote vocabulary teaching.