Apart from poetry, John Keats's concise remarks on poetics scatter miscellaneously in his other writings, whichhave been less studied compared with that of Keats's contemporary romantic poets. However, those terse remarksconstitute his deep perception on romantic poetry, many of which are now still glistening with their unique value.Based upon close reading upon Keats's poetical works and letters as well as later critics' books on poetry, thispaper intends to make a systematic study of Keats's poetics. Aiming at illustrating Keats' poetics, this paper fallsinto three parts--the first part being "Inspiration: Poetry as John Keats's Life", the second "Perspiration: NaturalGenius Plus Exquisite Revision", and the third "Perfection: the Aeolian Lyre".