在学术语境中，研究者倾向于使用特定的语言形式和结构来实现文本或语篇层面上的宏观功能，我们称之为学术话语功能。本文参照Halliday的语言元功能理论，描述与概括短语序列在学术文本中最常实现的三类话语功能：组织功能、指称功能和评价功能；它们是语篇元功能在学术语篇中的具体化表现。研究发现，某些短语序列被频繁地用于实施特定的学术话语功能，某种意义上，这些序列作为意义表达的核心承载，已成为具体功能的标志。

 In the academic context, the discourse community tends to have its preferred pattern and lexical realizations to unfold discourse, present information, and perform macro discoursal or textual functions. These functions are called academic discourse functions. Within Halliday’s framework of the metafunctions of language, this paper generalizes three primary discourse functions of phraseological sequences (PSs) in English academic texts: organizational, experiential, and stance, which are the specific embodiment of textualmatafunctions in academic discourse. It is argued that some PSs are so frequently used to perform concrete discourse functions that in a sense, the most typical of them become signals of the functions.