Abstract: Varieties of Categorical Imperatives in the context of Kant’s practical philosophy represent the thought purport of human being as an end in itself from different perspectives, and freedom is the fundamental value premise and also the normative basis for justifying Categorical Imperatives. In order to preserve and promote this value purport, confirming the universal law by the capacity of pure practical reason (unfolding as the duties of morality as inner constraint and the duties of right as external coercion) is the necessary approach, then avoid the abuse of freedom and destroy itself, and prevent the command derived from self or other sensory inclinations. Confirming fundamental idea of freedom, cultivating and exercising moral disposition, and promoting moral personality, are all the significant ways for practicing and accomplishing Categorical Imperatives. Baesd on the normative perspective, we can not only make a coherent understanding on Kant’s works in different period, then eliminate the weakness of single metaphysical justification, but also answer the misunderstanding and criticism efficiently about Kant’s ethics