本文论证了法律的概念体系中 ,法律主体概念是最基础的概念 ,由此提出法律的主体预定理论。通过对实在法律的历史分析 ,本文也就法律主体制度的核心原则和立法思想作出一种实证解释 ,提出罗马法以来的法律传统中 ,个人主体性有突出的表现 ,从而形成了由个人主体性决定的权利法内容的近现代法律局面。本文也分析了个人主体性法律的立法条件是协议性立法形式和程序 This article argues that in the concept system of law, the concept of legal subject is the most basic concept, and the main body of law is proposed. Through the historical analysis of real law, this article also makes an empirical interpretation of the core principles and legislative ideas of the legal subject system. In the legal tradition since the Roman law, the individual subjectivity has outstanding performance. Thus, Decided the content of the law of modern law legal situation. The article also analyzes that the legislative conditions of individual subjectivity law are the forms and procedures of the agreement legislation