多模态话语分析是当今话语分析领域的热点，逐步形成了三种主要的理论方法，包括系统功能多模态话语分析、多模态互动分析和语料库语言学多模态话语分析。本文对这三种理论方法从其理论基础、分析方法两方面进行阐述，探讨它们对认识人类互动的本质特征和研究方法的价值，并提出三者对多模态即席话语分析的内容、范畴、手段等问题的启示。

 Multimodal discourse analysis has become an important current research topic in discourse analysis. There have emerged three theoretical approaches to multimodal discourse, namely the systemic functional-multimodal discourse analysis, the multimodal interactional analysis, and the corpus linguistic approach to situated discourse. The paper is intended to make a critical survey of the three approaches with the focus on their respective theoretical bases and analytical methods. The insights they offer into the features of human interaction and its research are discussed. The paper also explores the relevance of the three approaches to the study of multimodal situated discourse with reference to the research content, analytical categories and techniques.