命题对于知识的心理表征、意义在记忆中的表征、以及语言的理解和产生具有重要的作用。本文讨论了命题的性质，简要评述了金特奇等人提出的命题模式，然后在对笔者及其它研究者的实验研究进行综合和对比分析之后，讨论了命题在文本处理过程中的作用，尤其是中国学生对英语文本的处理。 Proposition plays an important role in the psychological representation of knowledge, in the representation of meaning in memory, and in the understanding and production of language. This article discusses the nature of propositions, briefly reviews the propositional model proposed by Kintech et al., And then, after synthesizing and contrastively analyzing the experimental research of the author and other researchers, discusses the role of propositions in text processing, especially Chinese students deal with English texts.