Abstract: In recent years,there has been an increasing number of studies on the realist interpretation of Kant's ethics.These interpretation models can generally be classified into “law realism” and “value realism”.However,from the perspective of critics,the law realist interpretation fails to explain the problem that moral laws do not have fundamental and foundational status in Kant's ethics,while the value realist interpretation gets into a predicament in how to prove the origin of value itself.This article attempts to propose a “freedom realist” interpretation for Kant's ethics.This realism is ontologically a fundamental,relational,non-natural and mind-dependent realism,and epistemologically a practical cognitivist realism.This interpretation model not only has the reliability of the text and the rationality of the theory,but also can effectively resolve the difficulties faced by the above two realist interpretations,and can also respond to the doubts from moral metaphysics,moral epistemology and moral psychology,thus providing a more preferable interpretation model for Kant's ethics.