在美国宪法学界,阿克曼在《我们人民》系列中提出的二元民主理论可以说是“过去半世纪中美国宪法思想的最重要贡献之一”。本文将阿克曼的宪法理论带回到其在美国宪法学中的语境,在这一基础上解读了革命与制宪、宪法政治与常规政治、以及人民主权的法律表达与实践等二元民主论的构成要素。而回到中文语境,本文认为阿克曼的宪法理论是我们重新理解美国宪法的窗口,而不是解读中国宪法的工具,这不仅是因为阿克曼本人对于其理论的定位,也是比较宪法学自身的逻辑要求。 In the course of American constitutional law, the theory of binary democracy proposed by Ackerman in the “Our People” series can be said to be “one of the most important contributions of the constitutional thinking of the United States in the past half century.” This article brings Ackermann’s constitutional theory back to its context in American constitutional law, and on this basis, it interprets the binary such as the expression and practice of law in the fields of revolution and constitution, constitutional politics and conventional politics, and people’s sovereignty The Elements of Democracy. And back to the Chinese context, this paper argues that Ackerman’s constitutional theory is our window to re-understand the US constitution, not a tool to interpret the Chinese constitution, not only because of Ackerman’s own position on the theory, but also more constitutional Own logic requirements.