To Lakoff and Johnson,metaphors are not just matters of language,but are used extensively in reasoning and understanding.The book Metaphors We Live By itself is about understanding and cognition.It has laid the foundations of cognitive metaphor.Of course,there is no perfect theory;cognitive metaphor theory is no exception. Lakoff and Johnson only analyze English from the perspective of cognitive metaphor,they are lack of cross-language,cross-culture of cognitive research(Lan Chun,2005);in addition,Lakoff and Johnson do not deeply illustrate the change of internal structure in metaphorical mapping relationship.In general,Lakoff and Johnson pioneered the study of cognitive linguistics, this make us look at the world from a new perspective .In recent years ,moreand more postgraduates do their research from the perspective of cognitive metaphor ,and it is really helpful for academic paper.Therefore,the author thinks that Metaphors We Live By is a significant book for the research of metaphors.