阿云案始于神宗熙宁元年(1068),终于元丰八年(1085),共历17年方退出历史舞台。该案件几经讨论,影响深远。沉潜史料文献,梳理案件争议,提取案件背后隐藏的法学命题,用之与现代法学对话有着重要的理论与现实意义。“凡议法者,当先原立法之意”这一命题为司马光所提出,其本质是对“何为法律”这一法学原命题的追寻。 A cloud case began in the first year of Emperor Shen Ning (1068), and finally Yuanfeng eight years (1085), a total of 17 years left the stage of history. After discussion of the case, far-reaching impact. Submerging the historical documents, combing the controversial cases and extracting the hidden legal propositions behind the case have important theoretical and practical significance in their dialogues with modern jurisprudence. “Every lawyer, when the original meaning of the original law,” the proposition for Sima Guang’s proposition, its essence is “What is law ” the original proposition of law to pursue.