本文以多元脈絡以及社會一體為問題焦點，立基於系統理論，強調該理論所具有的差異理論特質，並透過一連串的理論建構來說明：先確定系統指涉，區別心理系統與社會系統，然後以溝通作為社會系統的基本操作，界定社會的意義，接著指出社會雖然由溝通所生產與再生產，但是社會卻不是溝通所能及，社會只能作為社會的自我描述，呈現在以社會為議題的溝通上，並點出現代社會是功能分化的社會，多元脈絡是無可避免的後果，任一個社會一體的觀念從此失去可以定於一尊的社會條件，社會秩序的可能性也必須建立在此功能分化的條件上，以自我再製功能系統的相互限制來取代規範性整合的觀點，相互競爭的社會一體的觀念（社會一體的語意），是在語意層次對此功能分化與多元脈絡處境的處理嘗試。

　　　　　The focus of this article is the problem of polycontextuality and the unity of society. It bases on the system theory and emphasizes its character as a theory of differentiation. This article explores the following points: First of all, the author will distinguish between the social system and the psychological system. Secondly, the author will define communication as basic unit of the society. The author also asserts that the society is what communications arrive, and that the society is not arrived by communications. In other words, the society is only a self-description of the society that exists as a theme in the communications. Thirdly, the author asserts that the modern society is a functional differentiated society and that the polycontextuality is not other than its necessary result. No concept of the unity of society is exclusively correct under these conditions. The possibility of the social order must also be observed under these conditions. The mutual limitation of the functional subsystem of society can better explain the integration of society than the theory of normative integration. The concepts of the unity of society compete with each other in the explanation of the result of the functional Differentiation and the polycontextuality in the semantic level.