康德的德性幸福论存在“德福不一”的困境,而作为至善的世界,应是德福一致。在《实践理性批判》中,康德试图通过“三公设”之设定来调和这对矛盾,但显然不能令人满意。在晚出九年的《法的形而上学原理》中,康德提出了“法权”思想,终于解决了这个问题,从而使得幸福从彼岸回到此岸。 Kant’s theory of moral happiness exists in the predicament of “not the same”, but as the world of perfection, it should be the same. In the “Critique of Practical Reason,” Kant tried to reconcile the contradictions through the establishment of “three public functions”, but apparently unsatisfactory. In “The Metaphysical Principle of Law” nine years later, Kant put forward the idea of ​​“power of law” and finally solved the problem, thus making happiness return to the other shore from the other side.