Conceptual metaphor, an important notion in the field of cognitive linguistics, influences not only the use of language, but human’s thinking and behavior as well. Firstly, this article discusses the nature of the two features of conceptual metaphor, i.e. systematicity and coherence. It then analyzes their manifestations in such language levels as lexicon, syntax, and discourse and proceeds to argue that the two features have implications in language teaching. Grounded on that, the relationship between conceptual metaphor and language teaching is discussed with particular respect to how the application of conceptual metaphor theory can promote the acquisition of vocabulary, varieties of sentence expressing patterns, and discourse coherence.