本文通过介词a、de的特性对“支配动词+a/de+不定式”的语言结构进行了对比性再研究,发现其特性中不仅蕴涵着句段的语义中心指向,而且蕴涵着“体”的特性,并作用于这一语言结构中a或de前后动词的语义协调和支配词的体含义显露和语义定位。a、de在引导不定式的“零语义”状态下,其特性发挥着很强的语法、语义主导定位作用,这种结构中的a、de并非毫无理据,a、de的各种特性是“零语义”的语言理据。本文主要阐释a、de的几种对立性语言规律。 This paper makes a contrastive study of the language structure of “dominating verb + a / de + infinitive ” through the characteristics of preposition a, de and finds that its characteristics not only imply the semantic center of the sentence, but also contains “ Body ”, and acts on the semantic coordination and dictation of the semantic meaning and semantic orientation of a or a before or after the verb in the language structure. a, de in guiding the infinitive “zero semantic ” state, its characteristics play a strong role of grammar, semantic dominant positioning, a, de in this structure is not without reason, a, de Features are the language grounds for “zero semantics.” This article mainly explains a, de several kinds of opposition language rules.