国际法是融合法律因素与其他哲学范畴因素的综合体。理性之于法律是其终身之目标。在众多条路径中,法哲学应是国际法追求理性真理的必然选择。法律论证理论能够以附条件的论辩达到我们认为的正确性。本文试图用法律论证理论分析平等原则之理性。 International law is a combination of legal factors and other philosophical categories. Reason is the law for life’s goal. In many ways, Jurisprudence should be the inevitable choice for the pursuit of rational truth in international law. The theory of legal argumentation can reach the correctness of what we think with conditional arguments. This article attempts to analyze the rationality of equality principle by legal argumentation theory.