Abstract: Three issues must be considered if the generation of textual metaphor is recognised from the angle of cognitive linguistics: the deviation of concept, the production of basic metaphor and the construction of textual megametaphor. After a conventional concept is blended into a metaphoric concept by means of crossdomain mapping, this new concept is stored in the unconscious cognitive system. In a speech communication, it acts as a basic metaphor, with its derived minor metaphors exerting unlimited extension in text and continuously constructing numerous and cohesive molecular propositions and further atomic ones so as to form a textual megametaphor. Through the input and output of conceptual network of its minor metaphors, a textual metaphor makes the thought represented and the text expanded.

Key words: text, metaphor, generative mechanism

摘要： 从认知语言学视角认识篇章隐喻的生成需考量三个问题：概念的偏离、基本隐喻的产生、篇章隐喻的建构。当常规概念经跨域映射合成新的隐喻性概念后，则被储存在无意识的认知系统中。言语交际进行时，它又以基本隐喻的身份被使用，其派生出的子喻体则可在语篇中无限延伸，被持续用来建构无数多且相连贯的分子、原子命题，形成篇章博喻的语义框架。篇章隐喻正是通过承载其子喻体的概念网络的输入、输出，使思想得以表达，篇幅得以扩展。

关键词: 篇章, 隐喻, 生成机制